BASE_CONVERTER
The single web page application featured in this tutorial web page converts an INPUT_SEQUENCE (i.e. an unsigned integer consisting of no more than eight digits) whose base is INPUT_BASE to its equivalent representation as an unsigned integer whose base is OUTPUT_BASE.
(The base conversion process used by this application is a more general version of the process used to convert unsigned integers from base-two to base-ten in the BITS_AND_BYTES tutorial web page of this website).
To view hidden text inside each of the preformatted text boxes below, scroll horizontally.
OUTPUT_SEQUENCE := CONVERT(INPUT_SEQUENCE, INPUT_BASE, OUTPUT_BASE). // First the base conversion process converts INPUT_SEQUENCE to its equivalent value in base-ten. Then that base-ten value is converted to its equivalent value in OUTPUT_BASE.
SOFTWARE_APPLICATION_COMPONENTS
Hyper-Text-Markup-Language_file: https://raw.githubusercontent.com/karlinarayberinger/KARLINA_OBJECT_summer_2023_starter_pack/main/base_converter.html
Cascading-Style-Sheet_file: https://raw.githubusercontent.com/karlinarayberinger/KARLINA_OBJECT_summer_2023_starter_pack/main/karbytes_aesthetic.css
JavaScript_file: https://raw.githubusercontent.com/karlinarayberinger/KARLINA_OBJECT_summer_2023_starter_packk/main/base_converter_interface.js
JavaScript_file: https://raw.githubusercontent.com/karlinarayberinger/KARLINA_OBJECT_summer_2023_starter_pack/main/base_converter_arithmetic.js
JavaScript_file: https://raw.githubusercontent.com/karlinarayberinger/KARLINA_OBJECT_summer_2023_starter_pack/main/time_stamp.js
Hyper-Text-Markup-Language Code
The following Hyper-Text-Markup-Language (HTML) code defines the user interface component of the BASE_CONVERTER web page application. Copy the HTML code from the source code file which is linked below into a text editor and save that file as base_converter.html. Use a web browser such as Firefox to open that HTML file (and ensure that the JavaScript and Cascading-Style-Sheet files are in the same file directory as the HTML file).
(Note that angle brackets which resemble HTML tags (i.e. an “is less than” symbol (i.e. ‘<‘) followed by an “is greater than” symbol (i.e. ‘>’)) displayed on this web page have been replaced (at the source code level of this web page) with the Unicode symbols U+003C (which is rendered by the web browser as ‘<‘) and U+003E (which is rendered by the web browser as ‘>’). That is because the WordPress web page editor or web browser interprets a plain-text version of an “is less than” symbol followed by an “is greater than” symbol as being an opening HTML tag (which means that the WordPress web page editor or web browser deletes or fails to display those (plain-text) inequality symbols and the content between those (plain-text) inequality symbols)).
If copy-pasting the following HTML code from the preformatted text box below into a text editor, remove the zero-width space Unicode character (​) which is located between the ‘s’ and the ‘r’ in the script tag(s) which each link to a JavaScript file.
Hyper-Text-Markup-Language_file: https://raw.githubusercontent.com/karlinarayberinger/KARLINA_OBJECT_summer_2023_starter_pack/main/base_converter.html
<!--
/**
* file: base_converter.html
* type: Hyper-Text-Markup-Language
* date: 10_JULY_2023
* author: karbytes
* license: PUBLIC_DOMAIN
*/
-->
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>BASE_CONVERTER</title>
<link rel="stylesheet" href="karbytes_aesthetic.css">
<script src="base_converter_arithmetic.js"></script>
<script src="base_converter_interface.js"></script>
<script src="time_stamp.js"></script>
<style>
.module {
border-radius: 5px;
padding: 10px;
}
.input_step {
background: #8fed77;
color: #000000;
}
.output_step {
background: #b877ed;
color: #000000;
}
#introduction {
background: #ffff00;
color: #000000;
}
#time_stamped_messages {
border-color: #00ff00;
border-width: 1px;
border-style: solid;
}
</style>
</head>
<body onload="initialize_application()">
<h1>BASE_CONVERTER</h1>
<p class="module" id="introduction">
Convert an INPUT_SEQUENCE (i.e. an unsigned integer consisting
of no more than eight digits) whose base is INPUT_BASE to its
equivalent representation as an unsigned integer whose base
is OUTPUT_BASE.
</p>
<div id="input_form"><p>#input_form</p></div>
<div id="output"><p>#output</p></div>
<div class="module console" id="time_stamped_messages"><p>#time_stamped_messages</p></div>
</body>
</html>
Cascading-Style-Sheet Code
The following Cascading-Style-Sheet (CSS) code defines a stylesheet which customizes the appearance of interface components of the BASE_CONVERTER web page application. Copy the CSS code from the source code file which is linked below into a text editor and save that file as karbytes_aesthetic.css.
Cascading-Style-Sheet_file: https://raw.githubusercontent.com/karlinarayberinger/KARLINA_OBJECT_summer_2023_starter_pack/main/karbytes_aesthetic.css
/**
* file: karbytes_aesthetic.css
* type: Cascading-Style-Sheet
* date: 10_JULY_2023
* author: karbytes
* license: PUBLIC_DOMAIN
*/
/** Make the page background BLACK, the text orange and monospace, and the page content width 800 pixels or less. */
body {
background: #000000;
color: #ff9000;
font-family: monospace;
font-size: 16px;
padding: 10px;
width: 800px;
}
/** Make input elements and select elements have an orange rounded border, a BLACK background, and orange monospace text. */
input, select {
background: #000000;
color: #ff9000;
border-color: #ff9000;
border-width: 1px;
border-style: solid;
border-radius: 5px;
padding: 10px;
appearance: none;
font-family: monospace;
font-size: 16px;
}
/** Invert the text color and background color of INPUT and SELECT elements when the cursor (i.e. mouse) hovers over them. */
input:hover, select:hover {
background: #ff9000;
color: #000000;
}
/** Make table data borders one pixel thick and CYAN. Give table data content 10 pixels in padding on all four sides. */
td {
color: #00ffff;
border-color: #00ffff;
border-width: 1px;
border-style: solid;
padding: 10px;
}
/** Set the text color of elements whose identifier (id) is "output" to CYAN. */
#output {
color: #00ffff;
}
/** Set the text color of elements whose class is "console" to GREEN and make the text background of those elements BLACK. */
.console {
color: #00ff00;
background: #000000;
}
JavaScript Code
The following JavaScript (JS) code defines functions which control the behavior of the user interface component of the BASE_CONVERTER web page application. Copy the JS code from the source code file which is linked below into a text editor and save that file as base_converter_interface.js.
JavaScript_file: https://raw.githubusercontent.com/karlinarayberinger/KARLINA_OBJECT_summer_2023_starter_pack/main/base_converter_interface.js
/**
* file: base_converter_interface.js
* type: JavaScript
* date: 10_JULY_2023
* author: karbytes
* license: PUBLIC_DOMAIN
*/
/**
* Make a particular HTML element on the web page whose source code file is base_converter.html invisible (without deleting that element).
*
* @param {String} element_id is assumed to be the id value of an existing HTML element on the web whose source code file is base_converter.html.
*/
function hide_page_element(element_id) {
try {
let web_page_element;
if (arguments.length !== 1) throw "exactly one function argument is required.";
if (typeof element_id !== "string") throw "element_id is required to be a String type value.";
if (element_id.length < 1) throw "element_id is required to be a non-empty string.";
web_page_element = document.getElementById(element_id);
web_page_element.style.display = "none";
}
catch(exception) {
console.log("An exception to normal functioning occurred during the runtime of hide_page_element(element_id): " + exception);
}
}
/**
* Make a particular HTML element on the web page defined by base_converter.html visible rather than hidden.
*
* @param {String} element_id is assumed to be the id value of an existing HTML element on the web page whos source code file is base_converter.html.
*/
function unhide_page_element(element_id) {
try {
let web_page_element;
if (arguments.length !== 1) throw "exactly one function argument is required.";
if (typeof element_id !== "string") throw "element_id is required to be a String type value.";
if (element_id.length < 1) throw "element_id is required to be a non-empty string.";
web_page_element = document.getElementById(element_id);
web_page_element.style.display = "block";
}
catch(exception) {
console.log("An exception to normal functioning occurred during the runtime of unhide_page_element(element_id): " + exception);
}
}
/**
* Generate the name of a particular numeric base in the following format: "[base_name] (base-[base_number])".
*
* @param {Number} cardinality_of_base is assumed to be a base-ten integer which is no smaller than two and no larger than sixteen.
*
* @return {String} the inner HTML component of an option for a base select menu; undefined if an exception to normal functioning occurs.
*/
function get_numeric_base_option_label(cardinality_of_base) {
try {
if (arguments.length !== 1) throw "exactly one function argument is required.";
if (typeof cardinality_of_base !== "number") throw "cardinality_of_base is required to be a Number type value.";
if (cardinality_of_base !== Math.floor(cardinality_of_base)) throw "cardinality_of_base is required to be a whole number.";
if ((cardinality_of_base < 2) || (cardinality_of_base > 16)) throw "cardinality_of_base is required to be no smaller than two and no larger than sixteen.";
if (cardinality_of_base === 2) return "BINARY (base-2)";
if (cardinality_of_base === 3) return "TERNARY (base-3)";
if (cardinality_of_base === 4) return "QUATERNARY (base-4)";
if (cardinality_of_base === 5) return "QUINARY (base-5)";
if (cardinality_of_base === 6) return "SENARY (base-6)";
if (cardinality_of_base === 7) return "SEPTENARY (base-7)";
if (cardinality_of_base === 8) return "OCTAL (base-8)";
if (cardinality_of_base === 9) return "NONARY (base-9)";
if (cardinality_of_base === 10) return "DECIMAL (base-10)";
if (cardinality_of_base === 11) return "UNDECIMAL (base-11)";
if (cardinality_of_base === 12) return "DUODECIMAL (base-12)";
if (cardinality_of_base === 13) return "TRIDECIMAL (base-13)";
if (cardinality_of_base === 14) return "TETRADECIMAL (base-14)";
if (cardinality_of_base === 15) return "PENTADECIMAL (base-15)";
if (cardinality_of_base === 16) return "HEXIDECIMAL (base-16)";
if (true) throw "some unexpected runtime error occurred.";
}
catch(exception) {
console.log("An exception to normal functioning occurred during the runtime of get_numeric_base_option_label(cardinality_of_base): " + exception);
return undefinied;
}
}
/**
* Define a select element whose options are the following natural number bases:
* 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16.
*
* Note that the option whose value is "2" is set to be automatically selected if the application user does not click on the select menu.
*
* @param {String} select_id is assumed to be the id of an existing select HTML element on the corresponding web page.
*
* @return {String} an HTML string which is used to instantiate a select element whose options are the following natural number bases:
* 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16;
* undefined if an exception to normal functioning occurs.
*/
function generate_html_string_for_base_select_menu(select_id) {
try {
let html_string = "", option_value = 0;
if (arguments.length !== 1) throw "exactly one function argument is required.";
if (typeof select_id !== "string") throw "select_id is required to be a String type value.";
if (select_id.length < 1) throw "select_id is required to be a non-empty string.";
html_string += '<' + 'select id="' + select_id + '"' + '>';
html_string += '<' + 'option value="2" selected' + '>' + get_numeric_base_option_label(2) + '<' + '/' + 'option' + '>';
for (option_value = 3; option_value <= 16; option_value += 1) html_string += '<' + 'option value="' + option_value + '"' + '>' + get_numeric_base_option_label(option_value) + '<' + '/' + 'option' + '>';
html_string += '<' + '/' + 'select' + '>';
return html_string;
}
catch(exception) {
console.log("An exception to normal functioning occurred during the runtime of generate_html_string_for_base_select_menu(select_id): " + exception);
return undefined;
}
}
/**
* Return the value of the selected menu option of a select menu element.
*
* @param {String} select_menu_identifier is assumed to be the id of an existing select HTML element on the corresponding web page.
*
* @return {String} the value of the selected menu option; undefined if an exception to normal functioning occurs.
*/
function get_selected_menu_option_value(select_menu_identifier) {
try {
let menu_object = {}, options_array = [], selected_option_index = 0, selected_option_object = {}, selected_option_value;
menu_object = document.getElementById(select_menu_identifier);
options_array = menu_object.options;
selected_option_index = menu_object.selectedIndex;
selected_option_object = options_array[selected_option_index];
selected_option_value = selected_option_object.value
return selected_option_value;
}
catch(exception) {
console.log("An exception to normal functioning occurred during the runtime of get_selected_menu_option(select_menu_identifier): " + exception);
return undefined;
}
}
/**
* Generate the digit key buttons which are used to enter digits whose base is cardinality_of_base.
*
* For example, if cardinality_of_base is 16, then all sixteen digit key buttons will be generated.
*
* By contrast, if cardinality_of_base is 10, then only the first ten of sixteen digit key buttons will be generated.
*
* The digit key buttons are arranged vertically in descending order (where each digit button is encapsulated inside of its own paragraph element).
*
* @param {Number} cardinality_of_base is assumed to be a base-ten integer which is no smaller than two and no larger than sixteen.
*
* @return {String} the HTML string which is used to substantiate the content of the div element whose id is "input_sequence_digit_keys_div";
* undefined if an exception to normal functioning occurs.
*/
function generate_html_string_for_input_sequence_digit_buttons(cardinality_of_base) {
try {
let html_string = "", p0 = '<' + 'p' + '>', p1 = '<' + '/' + 'p' + '>', i = 0, hexidecimal_digit_set = "0123456789ABCDEF";
if (arguments.length !== 1) throw "exactly one function argument is required.";
if (typeof cardinality_of_base !== "number") throw "cardinality_of_base is required to be a Number type value.";
if (cardinality_of_base !== Math.floor(cardinality_of_base)) throw "cardinality_of_base is required to be a whole number.";
if ((cardinality_of_base < 2) || (cardinality_of_base > 16)) throw "cardinality_of_base is required to be no smaller than two and no larger than sixteen.";
for (i = 0; i < cardinality_of_base; i += 1) html_string += p0 + '<' + 'input type="button" value="' + hexidecimal_digit_set[i] + '" onclick="append_digit_' + hexidecimal_digit_set[i] + '()"' + '>' + p1;
return html_string;
}
catch(exception) {
console.log("An exception to normal functioning occurred during the runtime of generate_html_string_for_input_sequence_digit_buttons(cardinality_of_base): " + exception);
return undefined;
}
}
/**
* Determine whether or not hexidecimal_digit is an element of the following set:
* ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' ].
*
* @param {String} hexidecimal_digit is assumed to be an element of the following set:
* ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' ].
*
* @return {Boolean} true if hexidecimal is a valid hexidecimal digit as defined above; false otherwise.
*/
function is_valid_hexidecimal_digit(hexidecimal_digit) {
try {
let i = 0, hexidecimal_digit_set = "0123456789ABCDEF";
if (arguments.length !== 1) throw "exactly one function argument is required.";
if (typeof hexidecimal_digit !== "string") throw "hexidecimal_digit is required to be a String type value.";
if (hexidecimal_digit.length !== 1) throw "hexidecimal_digit is required to have a length of exactly one character.";
for (i = 0; i < 16; i += 1) if (hexidecimal_digit === hexidecimal_digit_set[i]) return true;
return false;
}
catch(exception) {
console.log("An exception to normal functioning occurred during the runtime of is_valid_hexidecimal_digit(hexidecimal_digit): " + exception);
return false;
}
}
/**
* Remove the leftmost character from the inner HTML string of the span HTML element whose id is "input_sequence_span".
*
* Append hexidecimal_digit to right end of that string (such that the total number of characters enclosed by the input sequence span is always eight).
*
* @param {String} hexidecimal_digit is assumed to be an element of the following set:
* ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' ].
*/
function append_digit(hexidecimal_digit) {
try {
let i = 0, input_sequence_span, old_input_sequence = "", new_input_sequence = "";
if (!is_valid_hexidecimal_digit(hexidecimal_digit)) throw "hexidecimal_digit is required to be an element of the following set: ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' ].";
input_sequence_span = document.getElementById("input_sequence_span");
old_input_sequence = input_sequence_span.innerHTML;
for (i = 1; i < 8; i += 1) new_input_sequence += old_input_sequence[i];
new_input_sequence += hexidecimal_digit;
input_sequence_span.innerHTML = new_input_sequence;
}
catch(exception) {
console.log("An exception to normal functioning occurred during the runtime of append_digit_1(): " + exception);
}
}
/**
* Remove the leftmost character from the inner HTML string of the span HTML element whose id is "input_sequence_span".
*
* Append '0' to right end of that string (such that the total number of characters enclosed by the input sequence span is always eight).
*/
function append_digit_0() {
append_digit('0');
}
/**
* Remove the leftmost character from the inner HTML string of the span HTML element whose id is "input_sequence_span".
*
* Append '1' to right end of that string (such that the total number of characters enclosed by the input sequence span is always eight).
*/
function append_digit_1() {
append_digit('1');
}
/**
* Remove the leftmost character from the inner HTML string of the span HTML element whose id is "input_sequence_span".
*
* Append '2' to right end of that string (such that the total number of characters enclosed by the input sequence span is always eight).
*/
function append_digit_2() {
append_digit('2');
}
/**
* Remove the leftmost character from the inner HTML string of the span HTML element whose id is "input_sequence_span".
*
* Append '3' to right end of that string (such that the total number of characters enclosed by the input sequence span is always eight).
*/
function append_digit_3() {
append_digit('3');
}
/**
* Remove the leftmost character from the inner HTML string of the span HTML element whose id is "input_sequence_span".
*
* Append '4' to right end of that string (such that the total number of characters enclosed by the input sequence span is always eight).
*/
function append_digit_4() {
append_digit('4');
}
/**
* Remove the leftmost character from the inner HTML string of the span HTML element whose id is "input_sequence_span".
*
* Append '5' to right end of that string (such that the total number of characters enclosed by the input sequence span is always eight).
*/
function append_digit_5() {
append_digit('5');
}
/**
* Remove the leftmost character from the inner HTML string of the span HTML element whose id is "input_sequence_span".
*
* Append '6' to right end of that string (such that the total number of characters enclosed by the input sequence span is always eight).
*/
function append_digit_6() {
append_digit('6');
}
/**
* Remove the leftmost character from the inner HTML string of the span HTML element whose id is "input_sequence_span".
*
* Append '7' to right end of that string (such that the total number of characters enclosed by the input sequence span is always eight).
*/
function append_digit_7() {
append_digit('7');
}
/**
* Remove the leftmost character from the inner HTML string of the span HTML element whose id is "input_sequence_span".
*
* Append '8' to right end of that string (such that the total number of characters enclosed by the input sequence span is always eight).
*/
function append_digit_8() {
append_digit('8');
}
/**
* Remove the leftmost character from the inner HTML string of the span HTML element whose id is "input_sequence_span".
*
* Append '9' to right end of that string (such that the total number of characters enclosed by the input sequence span is always eight).
*/
function append_digit_9() {
append_digit('9');
}
/**
* Remove the leftmost character from the inner HTML string of the span HTML element whose id is "input_sequence_span".
*
* Append 'A' to right end of that string (such that the total number of characters enclosed by the input sequence span is always eight).
*/
function append_digit_A() {
append_digit('A');
}
/**
* Remove the leftmost character from the inner HTML string of the span HTML element whose id is "input_sequence_span".
*
* Append 'B' to right end of that string (such that the total number of characters enclosed by the input sequence span is always eight).
*/
function append_digit_B() {
append_digit('B');
}
/**
* Remove the leftmost character from the inner HTML string of the span HTML element whose id is "input_sequence_span".
*
* Append 'C' to right end of that string (such that the total number of characters enclosed by the input sequence span is always eight).
*/
function append_digit_C() {
append_digit('C');
}
/**
* Remove the leftmost character from the inner HTML string of the span HTML element whose id is "input_sequence_span".
*
* Append 'D' to right end of that string (such that the total number of characters enclosed by the input sequence span is always eight).
*/
function append_digit_D() {
append_digit('D');
}
/**
* Remove the leftmost character from the inner HTML string of the span HTML element whose id is "input_sequence_span".
*
* Append 'E' to right end of that string (such that the total number of characters enclosed by the input sequence span is always eight).
*/
function append_digit_E() {
append_digit('E');
}
/**
* Remove the leftmost character from the inner HTML string of the span HTML element whose id is "input_sequence_span".
*
* Append 'F' to right end of that string (such that the total number of characters enclosed by the input sequence span is always eight).
*/
function append_digit_F() {
append_digit('F');
}
/**
* Set the content displayed inside of the span HTML element whose id is "input_sequence_span" to "00000000".
*/
function initialize_input_sequence_span() {
try {
document.getElementById("input_sequence_span").innerHTML = "00000000";
}
catch(exception) {
console.log("An exception to normal functioning occurred during the runtime of initialize_input_sequence_span(): " + exception);
}
}
/**
* Set the inner HTML of the span element whose id is "input_sequence_span_2" and
* "input_sequence_span_3" to the inner HTML of the span element whose id is "input_sequence_span".
*/
function update_input_sequence_span() {
try {
let input_sequence_span, input_sequence_span_2, input_sequence_span_3;
input_sequence_span = document.getElementById("input_sequence_span");
input_sequence_span_2 = document.getElementById("input_sequence_span_2");
input_sequence_span_3 = document.getElementById("input_sequence_span_3");
input_sequence_span_2.innerHTML = input_sequence_span.innerHTML;
input_sequence_span_3.innerHTML = input_sequence_span.innerHTML;
}
catch(exception) {
console.log("An exception to normal functioning occurred during the runtime of update_input_sequence_span_2(): " + exception);
}
}
/**
* Set the content displayed inside of
* the span element whose id is "input_base_span",
* the span element whose id is "input_base_span_2", and
* the span element whose id is "input_base_span_3" to the
* input base option which is currently selected from the list of options
* displayed inside the select HTML element whose id is "input_base_menu".
*/
function update_input_base_span() {
try {
let input_base_value = 0, input_base_span, input_base_span_2, input_base_span_3;
input_base_span = document.getElementById("input_base_span");
input_base_span_2 = document.getElementById("input_base_span_2");
input_base_span_3 = document.getElementById("input_base_span_3");
input_base_value = get_selected_menu_option_value("input_base_menu");
input_base_span.innerHTML = input_base_value;
input_base_span_2.innerHTML = input_base_value;
input_base_span_3.innerHTML = input_base_value;
}
catch(exception) {
console.log("An exception to normal functioning occurred during the runtime of update_input_base_span(): " + exception);
}
}
/**
* Set the content displayed inside of the HTML element whose id is "digit_buttons_div"
* to display the digit buttons which correspond with the input base option
* which is currently selected from the list of options displayed inside the select HTML element whose id is "input_base_menu".
*/
function update_digit_buttons_div() {
try {
let input_base_value = 0, digit_buttons_div, digit_buttons_for_selected_base;
digit_buttons_div = document.getElementById("digit_buttons_div");
input_base_value = parseInt(get_selected_menu_option_value("input_base_menu"));
digit_buttons_for_selected_base = generate_html_string_for_input_sequence_digit_buttons(input_base_value);
digit_buttons_div.innerHTML = digit_buttons_for_selected_base;
}
catch(exception) {
console.log("An exception to normal functioning occurred during the runtime of update_input_base_span(): " + exception);
}
}
/**
* Set the content displayed inside of the span element whose id is "output_base_span_2"
* to the output base option which is currently selected from the list of options displayed
* inside the select HTML element whose id is "output_base_menu".
*/
function update_output_base_span_2() {
try {
let output_base_value = 0, output_base_span_2;
output_base_span_2 = document.getElementById("output_base_span_2");
output_base_value = get_selected_menu_option_value("output_base_menu");
output_base_span_2.innerHTML = output_base_value;
}
catch(exception) {
console.log("An exception to normal functioning occurred during the runtime of update_output_base_span_2(): " + exception);
}
}
/**
* Progress from STEP_0 to STEP_1 of the base converter application's input form (which is substantiated using the web page file named base_converter.html).
*
* Assume that this function is called in response to the event of a button click of the NEXT button displayed inside of the div whose id is "step_0_div".
*
* Submit the input base option which is currently selected from the list of options displayed inside the select HTML element whose id is "input_base_menu".
*
* Display the digit buttons which correspond with the selected input base in the next step.
*
* Append a time stamped message to the bottom of the web page indicating that this function was called.
*/
function step_0_next() {
const time_stamp = generate_time_stamp(), p0 = '<' + 'p' + '>', p1 = '<' + '/' + 'p' + '>';
let message = "step_0_next() was called at time: " + time_stamp;
console.log(message);
document.getElementById("time_stamped_messages").innerHTML += p0 + message + p1;
update_input_base_span();
update_digit_buttons_div();
hide_page_element("step_0_div");
unhide_page_element("step_1_div");
}
/**
* Regress from STEP_1 to STEP_0 of the base converter application's input form (which is substantiated using the web page file named base_converter.html).
*
* Assume that this function is called in response to the event of a button click of the BACK button displayed inside of the div whose id is "step_1_div".
*
* Reset the text displayed inside of the span element whose id is "input_sequence_span" to its initial state: 00000000.
*
* Append a time stamped message to the bottom of the web page indicating that this function was called.
*/
function step_1_back() {
const time_stamp = generate_time_stamp(), p0 = '<' + 'p' + '>', p1 = '<' + '/' + 'p' + '>';
let message = "step_1_back() was called at time: " + time_stamp;
console.log(message);
document.getElementById("time_stamped_messages").innerHTML += p0 + message + p1;
initialize_input_sequence_span();
hide_page_element("step_1_div");
unhide_page_element("step_0_div");
}
/**
* Progress from STEP_1 to STEP_2 of the base converter application's input form (which is substantiated using the web page file named base_converter.html).
*
* Assume that this function is called in response to the event of a button click of the NEXT button displayed inside of the div whose id is "step_1_div".
*
* Update the input base and input sequence displays inside of the STEP_2 div.
*
* Append a time stamped message to the bottom of the web page indicating that this function was called.
*/
function step_1_next() {
const time_stamp = generate_time_stamp(), p0 = '<' + 'p' + '>', p1 = '<' + '/' + 'p' + '>';
let message = "step_1_next() was called at time: " + time_stamp;
console.log(message);
document.getElementById("time_stamped_messages").innerHTML += p0 + message + p1;
update_input_sequence_span();
hide_page_element("step_1_div");
unhide_page_element("step_2_div");
}
/**
* Regress from STEP_2 to STEP_1 of the base converter application's input form (which is substantiated using the web page file named base_converter.html).
*
* Assume that this function is called in response to the event of a button click of the BACK button displayed inside of the div whose id is "step_2_div".
*
* Append a time stamped message to the bottom of the web page indicating that this function was called.
*/
function step_2_back() {
const time_stamp = generate_time_stamp(), p0 = '<' + 'p' + '>', p1 = '<' + '/' + 'p' + '>';
let message = "step_2_back() was called at time: " + time_stamp;
console.log(message);
document.getElementById("time_stamped_messages").innerHTML += p0 + message + p1;
initialize_input_sequence_span();
hide_page_element("step_2_div");
unhide_page_element("step_1_div");
}
/**
* Progress from STEP_2 to STEP_3 of the base converter application's input form (which is substantiated using the web page file named base_converter.html).
*
* Assume that this function is called in response to the event of a button click of the NEXT button displayed inside of the div whose id is "step_2_div".
*
* Submit the output base option which is currently selected from the list of options displayed inside the select HTML element whose id is "input_base_menu".
*
* Update the input_base, input_sequence, and output_base values which are displayed inside the STEP_3 div.
*
* Append a time stamped message to the bottom of the web page indicating that this function was called.
*/
function step_2_next() {
const time_stamp = generate_time_stamp(), p0 = '<' + 'p' + '>', p1 = '<' + '/' + 'p' + '>';
let message = "step_2_next() was called at time: " + time_stamp;
console.log(message);
document.getElementById("time_stamped_messages").innerHTML += p0 + message + p1;
update_output_base_span_2();
hide_page_element("step_2_div");
unhide_page_element("step_3_div");
}
/**
* Regress from STEP_3 to STEP_2 of the base converter application's input form (which is substantiated using the web page file named base_converter.html).
*
* Assume that this function is called in response to the event of a button click of the BACK button displayed inside of the div whose id is "step_3_div".
*
* Reset the text displayed inside of the div element whose id is "output" to its initial state: "This sentence will be replaced with base conversion results when the CONVERT button is clicked."
*
* Append a time stamped message to the bottom of the web page indicating that this function was called.
*/
function step_3_back() {
const time_stamp = generate_time_stamp(), p0 = '<' + 'p' + '>', p1 = '<' + '/' + 'p' + '>';
let message = "step_3_back() was called at time: " + time_stamp;
console.log(message);
document.getElementById("time_stamped_messages").innerHTML += p0 + message + p1;
initialize_output_div();
hide_page_element("step_3_div");
unhide_page_element("step_2_div");
}
/**
* Define the application interface component (to be displayed on the web page whose source code file is base_converter.html)
* which enables the user to select an INPUT_BASE.
*
* @return {String} an HTML string which is used to instantiate a DIV page element whose id is "step_0_div".
*/
function generate_html_string_for_step_0_div() {
let html_string = '<' + 'div class="module input_step" id="step_0_div"' + '>', p0 = '<' + 'p' + '>', p1 ='<' + '/' + 'p' + '>';
html_string += p0 + "STEP_0: Select an INPUT_BASE from the expandable menu. Then click the NEXT button to proceed to the INPUT_SEQUENCE step." + p1;
html_string += p0 + "INPUT_BASE := " + generate_html_string_for_base_select_menu("input_base_menu") + p1;
html_string += p0 + '<' + 'input type="button" value="NEXT" onclick="step_0_next()"' + '>';
html_string += '<' + '/' + 'div' + '>';
return html_string;
}
/**
* Define the application interface component (to be displayed on the web page whose source code file is base_converter.html)
* which enables the user to enter an INPUT_SEQUENCE.
*
* @return {String} an HTML string which is used to instantiate a DIV page element whose id is "step_1_div".
*/
function generate_html_string_for_step_1_div() {
let html_string = '<' + 'div class="module input_step" id="step_1_div"' + '>', p0 = '<' + 'p' + '>', p1 = '<' + '/' + 'p' + '>', input_sequence_span;
input_base_value = get_selected_menu_option_value("input_base_menu");
html_string += p0 + "STEP_1: Use the digit keys to enter no more than eight digits. Then click the NEXT button to proceed to the INPUT_SEQUENCE step. To re-select the INPUT_BASE, click the BACK button." + p1;
html_string += p0 + "INPUT_BASE := " + '<' + 'span style="background:#000000;color:#ffff00" id="input_base_span"' + '>' + input_base_value + '<' + '/' + 'span' + '>' + p1;
html_string += p0 + "INPUT_SEQUENCE := " + '<' + 'span style="background:#000000;color:#ffff00" id="input_sequence_span"' + '>' + "00000000" + '<' + '/' + 'span' + '>' + p1;
html_string += '<' + 'div id="digit_buttons_div"' + '>' + generate_html_string_for_input_sequence_digit_buttons(parseInt(input_base_value)) + '<' + '/' + 'div' + '>';
html_string += p0 + '<' + 'input type="button" value="BACK" onclick="step_1_back()"' + '>';
html_string += " " + '<' + 'input type="button" value="NEXT" onclick="step_1_next()"' + '>' + p1;
html_string += '<' + '/' + 'div' + '>';
return html_string;
}
/**
* Define the application interface component (to be displayed on the web page whose source code file is base_converter.html)
* which enables the user to review input values before initiating the base conversion.
*
* @return {String} an HTML string which is used to instantiate a DIV page element whose id is "step_2_div".
*/
function generate_html_string_for_step_2_div() {
let html_string = '<' + 'div class="module input_step" id="step_2_div"' + '>', p0 = '<' + 'p' + '>', p1 ='<' + '/' + 'p' + '>';
html_string += p0 + "STEP_2: Select an OUTPUT_BASE from the expandable menu. Then click the NEXT button to proceed to the BASE_CONVERSION step. To re-enter the INPUT_SEQUENCE, click the BACK button." + p1;
html_string += p0 + "INPUT_BASE := " + '<' + 'span style="background:#000000;color:#ffff00" id="input_base_span_2"' + '>' + "???" + '<' + '/' + 'span' + '>' + p1;
html_string += p0 + "INPUT_SEQUENCE := " + '<' + 'span style="background:#000000;color:#ffff00" id="input_sequence_span_2"' + '>' + "???" + '<' + '/' + 'span' + '>' + p1;
html_string += p0 + "OUTPUT_BASE := " + '<' + 'span style="background:#000000;color:#ffff00" id="output_base_span"' + '>' + generate_html_string_for_base_select_menu("output_base_menu") + '<' + '/' + 'span' + '>' + p1;
html_string += p0 + '<' + 'input type="button" value="BACK" onclick="step_2_back()"' + '>';
html_string += " " + '<' + 'input type="button" value="NEXT" onclick="step_2_next()"' + '>' + p1;
html_string += '<' + '/' + 'div' + '>';
return html_string;
}
/**
* Define the application interface component (to be displayed on the web page whose source code file is base_converter.html)
* which enables the user to click the CONVERT button.
*
* @return {String} an HTML string which is used to instantiate a DIV page element whose id is "step_3_div".
*/
function generate_html_string_for_step_3_div() {
let html_string = '<' + 'div class="module input_step" id="step_3_div"' + '>', p0 = '<' + 'p' + '>', p1 ='<' + '/' + 'p' + '>';
html_string += p0 + "STEP_3: Click the CONVERT button to convert INPUT_SEQUENCE to its OUTPUT_BASE representation. To re-select the OUTPUT_BASE, click the BACK button." + p1;
html_string += p0 + "INPUT_BASE := " + '<' + 'span style="background:#000000;color:#ffff00" id="input_base_span_3"' + '>' + "???" + '<' + '/' + 'span' + '>' + p1;
html_string += p0 + "INPUT_SEQUENCE := " + '<' + 'span style="background:#000000;color:#ffff00" id="input_sequence_span_3"' + '>' + "???" + '<' + '/' + 'span' + '>' + p1;
html_string += p0 + "OUTPUT_BASE := " + '<' + 'span style="background:#000000;color:#ffff00" id="output_base_span_2"' + '>' + "???" + '<' + '/' + 'span' + '>' + p1;
html_string += p0 + '<' + 'input type="button" value="BACK" onclick="step_3_back()"' + '>';
html_string += " " + '<' + 'input type="button" value="CONVERT" onclick="convert()"' + '>' + p1;
html_string += '<' + '/' + 'div' + '>';
return html_string;
}
/**
* Set the content displayed inside of the div HTML element whose id is "output" to its initial placeholder text.
*/
function initialize_output_div() {
try {
let p0 = '<' + 'p class="module output_step"' + '>', p1 = '<' + '/' + 'p' + '>';
document.getElementById("output").innerHTML = p0 + "This sentence will be replaced with base conversion results when the CONVERT button is clicked." + p1;
}
catch(exception) {
console.log("An exception to normal functioning occurred during the runtime of initialize_output_div(): " + exception);
}
}
/**
* Set the web page interface (i.e. base_converter.html) to its intial state.
*
* Assume that this function is called in response the event of the web page being loaed by the web browser.
*/
function initialize_application() {
try {
const time_stamp = generate_time_stamp(), p0 = '<' + 'p' + '>', p1 = '<' + '/' + 'p' + '>';
let message = "The web page, base_converter.html, was loaded at time: " + time_stamp;
let input_form_div = undefined;
console.log(message);
document.getElementById("time_stamped_messages").innerHTML = p0 + message + p1;
input_form_div = document.getElementById("input_form");
initialize_output_div();
input_form_div.innerHTML = generate_html_string_for_step_0_div();
input_form_div.innerHTML += generate_html_string_for_step_1_div();
input_form_div.innerHTML += generate_html_string_for_step_2_div();
input_form_div.innerHTML += generate_html_string_for_step_3_div();
hide_page_element("step_1_div");
hide_page_element("step_2_div");
hide_page_element("step_3_div");
}
catch(exception) {
console.log("An exception to normal functioning occurred during the runtime of initialize_application(): " + exception);
}
}
/**
* Perform the base converion using the input values which were submitted by the application user via the web page interface.
*
* Convert an INPUT_SEQUENCE (i.e. an unsigned integer consisting of no more than eight digits)
* whose base is INPUT_BASE to its equivalent representation as an unsigned integer whose base is OUTPUT_BASE.
*
* Append a time stamped message to the bottom of the web page indicating that this function was called.
*/
function convert() {
try {
const time_stamp = generate_time_stamp();
let message = "convert() was called at time: " + time_stamp;
let INPUT_BASE = 0, INPUT_SEQUENCE = "", OUTPUT_BASE = 0, OUTPUT_SEQUENCE = "";
let p00 = '<' + 'p class="module" style="border-color: #00ffff; border-width: 1px;border-style: solid;"' + '>', p0 = '<' + 'p' + '>', p1 = '<' + '/' + 'p' + '>';
console.log(message);
document.getElementById("time_stamped_messages").innerHTML += p0 + message + p1;
INPUT_BASE = parseInt(document.getElementById("input_base_span").innerHTML);
INPUT_SEQUENCE = document.getElementById("input_sequence_span").innerHTML;
OUTPUT_BASE = parseInt(document.getElementById("output_base_span_2").innerHTML);
OUTPUT_SEQUENCE = perform_base_conversion(INPUT_BASE, INPUT_SEQUENCE, OUTPUT_BASE);
document.getElementById("output").innerHTML = p00 + INPUT_SEQUENCE + " (in base-" + INPUT_BASE + ") is equal to " + OUTPUT_SEQUENCE + " (in base-" + OUTPUT_BASE + ")." + p1
}
catch(exception) {
console.log("An exception to normal functioning occurred during the runtime of convert(): " + exception);
}
}
JavaScript Code
The following JavaScript (JS) code defines functions which perform the arithmetic operations involved in converting INPUT_SEQUENCE from INPUT_BASE to OUTPUT_BASE when using the BASE_CONVERTER web page application. Copy the JS code from the source code file which is linked below into a text editor and save that file as base_converter_arithmetic.js.
JavaScript_file: https://raw.githubusercontent.com/karlinarayberinger/KARLINA_OBJECT_summer_2023_starter_pack/main/base_converter_arithmetic.js
/**
* file: base_converter_arithmetic.js
* type: JavaScript
* date: 10_JULY_2023
* author: karbytes
* license: PUBLIC_DOMAIN
*/
/**
* Get the result of the following calculation: base ^ exponent (i.e. base to the power of exponent (i.e. base multiplied by itself exponent times))
* .
* @param {Number} base is assumed to be a base-ten natural number which is no smaller than two and no larger than sixteen.
*
* @param {Number} exponent is assumed to be a base-ten natural number which is no smaller than zero and no larger than seven.
*
* @return {Number} base multiplied by itself exponent times if no exception is thrown; otherwise 1.
*/
function compute_power(base, exponent) {
try {
let result = 1;
if (arguments.length !== 2) throw "exactly two function arguments are required.";
if (typeof base !== "number") throw "base is required to be a Number type value.";
if (typeof exponent !== "number") throw "exponent is required to be a Number type value.";
if (Math.floor(base) !== base) throw "base is required to be a whole number.";
if (Math.floor(exponent) !== exponent) throw "exponent is required to be a whole number.";
if ((base < 2) || (base > 16)) throw "base is required to be no smaller than two and no larger than sixteen.";
if ((exponent < 0) || (exponent > 7)) throw "exponent is required to be no smaller than zero and no larger than seven.";
while (exponent > 0) {
result *= base;
exponent -= 1;
}
return result;
}
catch(exception) {
console.log("An exception to normal functioning occurred during the runtime of compute_power(base, exponent): " + exception);
return 1;
}
}
/**
* Determine whether or not the given function arguments represents a valid input_sequence with whose digits are in the input_base.
*
* @param {Number} input_base is assumed to be a base-ten integer which is no smaller than two and no larger than sixteen.
*
* @param {String} input_sequence is assumed to be a sequence of exactly eight characters such that each character is a digit whose numeric base is input_base.
*
* @return {Boolean} true if input_sequence is a string comprised of exactly eight characters such that each character is a digit whose numeric base is input_base; false otherwise.
*/
function validate_input_sequence(input_base, input_sequence) {
try {
let hexidecimal_digit_set = "0123456789ABCDEF", i = 0, k = 0, is_valid_input_sequence_digit = false;
if (arguments.length !== 2) throw "exactly two function arguments are required.";
if (typeof input_base !== "number") throw "input_base is required to be a Number type value.";
if (typeof input_sequence !== "string") throw "input_sequence is required to be a String type value.";
if (Math.floor(input_base) !== input_base) throw "input_base is required to be a whole number.";
if ((input_base < 2) || (input_base > 16)) throw "input_base is required to be no smaller than two and no larger than sixteen.";
if (input_sequence.length !== 8) throw "input_sequence is required to have a length of exactly eight characters.";
for (i = 0; i < 8; i++) {
for (k = 0; k < input_base; k++) if (input_sequence[i] === hexidecimal_digit_set[k]) is_valid_input_sequence_digit = true;
if (!is_valid_input_sequence_digit) throw "at least one character in input_sequence is not a valid digit (i.e. a digit whose base is input_base).";
is_valid_input_sequence_digit = false;
}
return true;
}
catch(exception) {
console.log("An exception to normal functioning occurred during the runtime of convert_to_decimal(input_base, input_sequence): " + exception);
return false;
}
}
/**
* Return the decimal integer index of the hexidecimal digit which H represents where hexidecimal digits
* are the following set of characters arranged in the following permutation:
* ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F']
*
* @param {String} H is assumed to be a single hexidecimal digit.
*
* @return {Number} the decimal integer index of the hexidecimal digit which H represents.
*/
function get_decimal_value_of_hexidecimal_digit(H) {
if (H === '0') return 0;
if (H === '1') return 1;
if (H === '2') return 2;
if (H === '3') return 3;
if (H === '4') return 4;
if (H === '5') return 5;
if (H === '6') return 6;
if (H === '7') return 7;
if (H === '8') return 8;
if (H === '9') return 9;
if (H === 'A') return 10;
if (H === 'B') return 11;
if (H === 'C') return 12;
if (H === 'D') return 13;
if (H === 'E') return 14;
if (H === 'F') return 15;
return 0;
}
/**
* Get the decimal number representation of input_sequence by converting input_sequence from input_base to decimal (i.e. base-ten).
*
* @param {Number} input_base is assumed to be a base-ten integer which is no smaller than two and no larger than sixteen.
*
* @param {String} input_sequence is assumed to be a sequence of exactly eight characters such that each character is a digit whose numeric base is input_base.
*
* @return {Number} the base-ten number which input_sequence in the input_base represents; zero if an exception to normal functioning is thrown.
*/
function convert_to_decimal(input_base, input_sequence) {
try {
let decimal_output = 0, i = 0;
if (!validate_input_sequence(input_base, input_sequence)) throw "input_base or input_sequence appears to be an invalid function argument.";
for (i = 0; i < 8; i++) decimal_output += (get_decimal_value_of_hexidecimal_digit(input_sequence[i]) * compute_power(input_base, 7 - i));
return decimal_output;
}
catch(exception) {
console.log("An exception to normal functioning occurred during the runtime of convert_to_decimal(input_base, input_sequence): " + exception);
return 0;
}
}
/**
* Get the hexidecimal equivalent of a single decimal digit.
*
* @param {Number} D is assumed to be a single base-ten digit (i.e. exactly one element within the following array:
* [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]).
*
* @return {String} the element of the following array whose index in the array is D:
* ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'] if D is a valid decimal digit;
* '0' otherwise.
*/
function convert_decimal_digit_to_hexidecimal(D) {
try {
let hexidecimal_digit_set = "0123456789ABCDEF";
if (arguments.length !== 1) throw "exactly one function argument is required.";
if (typeof D !== "number") throw "D is required to be a Number type value.";
if (Math.floor(D) !== D) throw "D is required to be a whole number.";
if ((D < 0) || (D > 9)) "D is required to be no smaller than zero and no larger than nine.";
return hexidecimal_digit_set[D];
}
catch(exception) {
console.log("An exception to normal functioning occurred during the runtime of convert_decimal_digit_to_hexidecimal(D): " + exception);
return '0';
}
}
/**
* Return a string whose constituent characters are identical to the characters in S except for the fact that
* the output string characters are in reverse order from those in S.
*
* @param {String} S is assumed to be a sequence of characters.
*
* @return {String} S in reverse order.
*/
function reverse_string(S) {
try {
let output_string = "", i = 0;
if (arguments.length !== 1) throw "exactly one function argument is required.";
if (typeof S !== "string") throw "output_string is required to be a String type value.";
for (i = (S.length - 1); i >= 0; i--) output_string += S[i];
return output_string;
}
catch(exception) {
console.log("An exception to normal functioning occurred during the runtime of reverse_string(S): " + exception);
return "ERROR";
}
}
/**
* Get the output_base representation of decimal_number by converting decimal_number from decimal (i.e. base-ten) to output_base.
*
* @param {Number} output_base is assumed to be a base-ten integer which is no smaller than two and no larger than sixteen.
*
* @param {Number} decimal_number is assumed to be a base-ten integer no smaller than zero and no larger than the following sum:
* (16 * (16 ^ 7)) + (16 * (16 ^ 6)) + (16 * (16 ^ 5)) + (16 * (16 ^ 4)) + (16 * (16 ^ 3)) + (16 * (16 ^ 2)) + (16 * (16 ^ 1)) + (16 * (16 ^ 0)) = 4581298448.
*
* @return {String} a sequence of one ore more hexidecimal digits which represents the value of decimal_number in the given output_base.
*/
function convert_from_decimal(output_base, decimal_number) {
try {
let maximum_decimal_number_value = 0, i = 0, output_base_result = "";
if (arguments.length !== 2) throw "exactly two function arguments are required.";
if (typeof output_base !== "number") throw "output_base is required to be a Number type value.";
if (typeof decimal_number !== "number") throw "decimal_number is required to be a Number type value.";
if (Math.floor(output_base) !== output_base) throw "output_base is required to be a whole number.";
if (Math.floor(decimal_number) !== decimal_number) throw "decimal_number is required to be a whole number.";
if ((output_base < 2) || (output_base > 16)) throw "output_base is required to be no smaller than two and no larger than sixteen.";
for (i = 7; i >= 0; i -= 1) maximum_decimal_number_value += (16 * compute_power(16, i));
if ((decimal_number < 0) || (decimal_number > maximum_decimal_number_value)) throw "decimal_number is required to be larger than zero and no larger than " + maximum_decimal_number_value + ".";
while (decimal_number > 0) {
output_base_result += convert_decimal_digit_to_hexidecimal(decimal_number % output_base);
decimal_number = Math.floor(decimal_number / output_base);
}
return reverse_string(output_base_result);
}
catch(exception) {
console.log("An exception to normal functioning occurred during the runtime of convert_from_decimal(output_base, decimal_number): " + exception);
return '0';
}
}
/**
* Convert an INPUT_SEQUENCE (i.e. an unsigned integer consisting of no more than eight digits)
* whose base is INPUT_BASE to its equivalent representation as an unsigned integer whose base is OUTPUT_BASE.
*
* This is the "main function" of this JavaScript file (i.e. the "macro function" which implements each of the arithmetic functions defined above).
*
* @param {Number} input_base is assumed to be a base-ten integer which is no smaller than two and no larger than sixteen.
*
* @param {String} input_sequence is assumed to be a sequence of exactly eight characters such that each character is a digit whose numeric base is input_base.
*
* @param {Number} output_base is assumed to be a base-ten integer which is no smaller than two and no larger than sixteen.
*
* @return {String} input_sequence in its output_base representation if no exception to normal functioning is thrown; "0" otherwise.
*/
function perform_base_conversion(input_base, input_sequence, output_base) {
try {
let decimal_number = convert_to_decimal(input_base, input_sequence);
return convert_from_decimal(output_base, decimal_number);
}
catch(exception) {
console.log("An exception to normal functioning occurred during the runtime of perform_base_conversion(input_base, input_sequence, output_base): " + exception);
return '0';
}
}
JavaScript Code
The following JavaScript (JS) code defines one function which controls the behavior of the BASE_CONVERTER web page application; namely the function which returns the number of milliseconds elapsed since the Unix Epoch concatenated to the string ” milliseconds since midnight on 01_JANUARY_1970″. Copy the JS code from the source code file which is linked below into a text editor and save that file as time_stamp.js.
JavaScript_file: https://raw.githubusercontent.com/karlinarayberinger/KARLINA_OBJECT_summer_2023_starter_pack/main/time_stamp.js
/**
* file: time_stamp.js
* type: JavaScript
* date: 10_JULY_2023
* author: karbytes
* license: PUBLIC_DOMAIN
*/
/**
* Get the Number of milliseconds which have elapsed since the Unix Epoch.
* The Unix Epoch is 01_JANUARY_1970 at midnight (Coordinated Universal Time (UTC)).
*
* @return {String} message displaying the time at which this function was called.
*/
function generate_time_stamp() {
const milliseconds_elapsed_since_unix_epoch = Date.now();
return milliseconds_elapsed_since_unix_epoch + " milliseconds since midnight on 01_JANUARY_1970.";
}
BASE_CONVERTER Interface (Initial)
The screenshot image below depicts what the BASE_CONVERTER web page interface is supposed to look like when the web page is initially loaded by a web browser.
BASE_CONVERTER Interface (Step One)
The screenshot image below depicts one possible configuration of what the the BASE_CONVERTER web page interface could look like after the user selects an INPUT_BASE from the expandable menu and then clicks on the NEXT button in the “step_0” module portion of the “input_form”.
(Note that only digit keys in the INPUT_BASE will appear and more than eight digits can be input into INPUT_SEQUENCE. If more than eight digits are input, the leftmost digit will be removed while the most recently input digit will be appended to the rightmost end of the INPUT_SEQUENCE).
BASE_CONVERTER Interface (Step Two)
The screenshot image below depicts one possible configuration of what the the BASE_CONVERTER web page interface could look like after the user enters digits into an INPUT_SEQUENCE using the INPUT_BASE digit buttons and then clicks on the NEXT button in the “step_1” module portion of the “input_form”.
(Note that the user can use BACK buttons to return to previous steps in order to change the input values).
BASE_CONVERTER Interface (Step Three)
The screenshot image below depicts one possible configuration of what the the BASE_CONVERTER web page interface could look like after the user selects an OUTPUT_BASE from the expandable menu and then clicks on the NEXT button in the “step_2” module portion of the “input_form”.
BASE_CONVERTER Interface (Final)
The screenshot image below depicts one possible configuration of what the BASE_CONVERTER web page interface could look like after the user clicks on the CONVERT button in the “step_3” module portion of the “input_form”.
This web page was last updated on 17_OCTOBER_2024. The content displayed on this web page is licensed as PUBLIC_DOMAIN intellectual property.