How to make the mod of a negative number to be positive?

Question

Basically, I need (-3) % 5 to be \"2\" instead of \"-3\". Python produces \"2\", but C++ produces \"-3\". Not sure how to produce \"2\" in C++. Thanks!

Answer 1

Add the base if the input number X is negative:

X % Y + (X % Y < 0 ? Y : 0);