C/math.h/nearbyint
nearbyint: returns the value of arg rounded to the nearest integer
//Declaration: float nearbyintf(float arg);
double nearbyint(double arg);
long double nearbyintl(long double arg);
#include <math.h>
#include <stdio.h>
int main(void)
{
double f;
f = nearbyint (2.3);
printf("%f " , f);
}
/*
2.000000
*/