/*
Exercise 7.4: Summation

    Write a function summation(n) that takes a single argument n, and computes the sum of all integers
        up to n starting from 0
    For example: summation(3) -> 1 + 2 + 3 = 6
    Or: summation(7) -> 1 + 2 + 3 + 4 + 5 + 6 + 7 = 28
    Use while-loop
*/


function summation(n) {
    let count = 1;
    let sum = 0;
    while (count <= n) {
        sum = sum + count;
        count++;
    }
    return sum;
}

alert(summation(3)); // print out 6
alert(summation(7)); // print out 28
alert(summation(15)); // print out 120
alert(summation(56)); // print out 1596
alert(summation(106)); // print out 5671