How to add the numbers used in loops?

[Sinoka]

Like

1
2
3
4
5

And here it will write the sum of the numbers above using loops
So 1+2+3+4+5=15
what is the code should I use to make it show 15 using loops or while statements or if else codes?

[Dormilich]

actually, you don’t need a loop at all, just some maths. the formula to calculate the series of natural numbers is well known.

∑(n) = n · (n + 1) / 2

[Bharat383]

<script type="text/javascript">
var  temp = 0;
for(a=1;a<=5;a++)
{
    temp = temp + a;
}

alert(temp);
</script>