C/math.h/fdim
fdim: returns zero if a is less than or equal to b. Otherwise, returns a - b
//Declaration: float fdimf(float a, float b);
double fdim(double a, double b);
long double fdiml(long double a, long double b);
//Return: returns zero if a is less than or equal to b.
Otherwise, returns a - b.
#include <math.h>
#include <stdio.h>
int main(void)
{
printf("%1.1f", fdimf (1.0, -1.0));
return 0;
}
/*
2.0
*/