C/math.h/nexttoward
nexttoward: returns the next value after "from" that is closer to "towards"
//Declaration: float nexttowardf(float from, long double towards);
double nexttoward(double from, long double towards);
long double nexttowardl(long double from, long double towards);
#include <math.h>
#include <stdio.h>
int main(void)
{
double f;
f = nexttoward (2.3,1.2);
printf("%f " , f);
}