// external js file
// Write all JavaScript code here

// define function - block of code to show welcome message
function sayHello() {
  alert('Hello All! Welcome to JavaScript!!');
}

// define function - block of code to show total of two numbers
function showTotal() {
  var num1 = 10;
  var num2 = 20;
  var total = num1 + num2;
  alert('Total is : ' + total);
}

// invoke / run  / call a function
sayHello();
showTotal();