How modulus operation works in C++? [closed]

The answer is correct. ‘%’ mean “reminder”. The % operator is remainder operator. The A % B operator actually answer the question “If I divided A by B using integer arithmetic, what would the remainder be?”

dividend = quotient * divisor + remainder

0 % 4 = 0
1 % 4 = 1
2 % 4 = 2
3 % 4 = 3
4 % 4 = 0
5 % 4 = 1
.....
etc..

For negative number…

   1 % (-4) = 1
(-2) % 4    = -2
(-3) % (-4) = -3

With a remainder operator, the sign of the result is the same as the sign of the dividend

you can read more at What’s the difference between “mod” and “remainder”?