C/math.h/fmax
fmax: returns the greater of a and b
//Declaration: float fmaxf(float a, float b);
double fmax(double a, double b);
long double fmaxl(long double a, long double b);
#include <math.h>
#include <stdio.h>
int main(void)
{
printf("%l", fmaxl (10,12));
}