Loop

[yakyak]

What is the value of n after the following nested loops?

  int n = 0;
	for (int i = 1; i <= 5; i++)
		for (int j = 0; j < i; j++)
			n = n + j;

I tested it out and the value was 20. But Im not sure how the process works.

[xismn]

i: 1
j: 0
n = 0 + 0

i: 2
j: 0
n = 0 + 0
j: 1
n = 0 + 1

i: 3
j: 0
n = 1 + 0
j: 1
n = 1 + 1
j: 2
n = 2 + 2

i: 4
j: 0
n = 4 + 0
j: 1
n = 4 + 1
j: 2
n = 5 + 2
j: 3
n = 7 + 3

i: 5
j: 0
n = 10 + 0
j: 1
n = 10 + 1
j: 2
n = 11 + 2
j: 3
n = 13 + 3
j: 4
n = 16 + 4

[yakyak]

Thank you @xsimn! :)