FLOOR(3M) — System Interface Manual — Mathematical Functions

NAME

fabs, floor, ceil − absolute value, floor, ceiling functions

#include <math.h>

double floor(x)
double x;

double ceil(x)
double x;

double fabs(x)
double x;

Fabs returns the absolute value |x|.

Floor returns the largest integer not greater than x.

Ceil returns the smallest integer not less than x.