C/math.h/fma
fma: returns the rounding value of a * b + c
//Declaration: float fmaf(float a, float b, float c);
double fma(double a, double b, double c);
long double fmal(long double a, long double b, long double c);
#include <math.h>
#include <stdio.h>
int main(void)
{
printf("%f", fmal (10.2,12,9));
}
/*
-0.000000
*/