Syntax:
#include <cmath> double fmod( double x, double y );
The fmod() function returns the remainder of x/y.
C++ also provides the following overloaded forms:
#include <cmath> float fmod( float x, float y ); // same as fmodf() in C99 long double fmod( long double x, long double y ); // same as fmodl() in C99