Remainder of float division

Question

How do I compute the remainder of the division of two floats?

Answer 1

How about a-floor(a/b)*b - presuming a and b both positive?

You could say that "remainder" is not a proper concept for float divisions, but I'll leave that to your own judgment.

Answer 2

Use fmod, which computes the floating point modulus.

double remainder = fmod(a_double, another_double);

If you want to use float instead of double you'd use fmodf instead.