What does a percentage sign (%) do mathematically in Objective C?

Question

I am super confused what the percentage sign does in Objective C. Can someone explain to me in language that an average idiot like myself can understand?! Thanks.

Answer 1

% is the modulo operator, so for example 10 % 3 would result in 1.

If you have some numbers a and b, a % b gives you just the remainder of a divided by b.

So in the example 10 % 3, 10 divided by 3 is 3 with remainder 1, so the answer is 1.

If there is no remainder to a divided by b, the answer is zero, so for example, 4 % 2 = 0.

Here's a relevant SO question about modular arithmetic.