Computes the floating-point remainder of x/y.
#include <math.h> double fmod ( double x, double y);
(IN) Specifies the arguments for which the floating-point remainder is to be computed.
Returns the value x - ( i * y), for some integer i such that, if y is nonzero, the result has the same sign as x and a magnitude less than the magnitude of y.
If the value of y is zero, the value returned is zero.
The fmod function computes the floating-point remainder of x / y, even if the quotient x / y is not representable.