How is the out put of n = 3

Question

if m=24 and n= 7

n=m % n--

cout <<n;

Answer 1

27 divided by 7, gives a remainder of 3

% means remainder, after a divide

a % b = r

r is the remainder of a divided by b.

Answer 2

I think you meant '24 divided by 7' Xan :)