fdim, fdimf, fdiml - positive difference

#include <math.h> I double fdim(double x , double y );
I float fdimf(float x , float y );
I long double fdiml(long double x , long double y ); Compile with -std=c99; link with -lm.

These functions return max(x-y,0). If x or y or both are NaN, Nan is returned.

C99

fmax(3)