rint, rintf, remainder, remainderf---round and  remainder#include <math.h> double rint(double x); float rintf(float x); double remainder(double x, double y); float remainderf(float x, float y);Description
rint and rintf returns their argument rounded to the nearest
integer.  remainder and remainderf find the remainder of
x/y; this value is in the range -y/2 .. +y/2.
Returns
rint and remainder return the integer result as a double.
Portability
rint and remainder are System V release 4.  rintf and
remainderf are extensions.