NAME

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

SYNOPSIS

#include <math.h>

double floor (x)
double x;

double ceil (x)
double x;

double fmod (x, y)
double x, y;

double fabs (x)
double x;

DESCRIPTION

Floor returns the largest integer (as a double-precision number) not greater than x.

Ceil returns the smallest integer not less than x.

Fmod returns the floating-point remainder (f) of the division of x by y, where f has the same sign as x, such that x = iy + f for some integer i, and |f| < |y|.

Fabs returns the absolute value of x, |x|.

DEPENDENCIES

Series 300
Fmod returns x if y is 0.0 or if x/y would overflow. 

Series 800 (/lib/libm.a)
When x is ±INFINITY , floor and ceil return ±INFINITY respectively. 

Fabs returns +INFINITY when x is ±INFINITY . 

Fmod returns x if y is 0.0, if x/y would overflow, or if x/y would underflow (including when y is ±INFINITY ). 

Series 800 (ANSI C /lib/LibM.a)
When x is ±INFINITY , floor and ceil return ±INFINITY respectively. 

Fabs returns +INFINITY when x is ±INFINITY . 

Fmod returns 0.0 if x/y would overflow, or x if x/y would underflow (including when y is ±INFINITY ). 

ERRORS

Series 800 (/lib/libm.a)
Floor and ceil return NaN and set errno to EDOM when x is NaN. 

Fmod returns NaN and sets errno to EDOM when x or y is NaN, or when x is ±INFINITY . 

Fabs returns NaN and sets errno to EDOM when x is NaN. 

Series 800 (ANSI C /lib/libM.a)
Floor and ceil return NaN and set errno to EDOM when x is NaN. 

Fmod returns NaN and sets errno to EDOM when y is 0.0, when x or y is NaN, or when x is ±INFINITY . 

Fabs returns NaN and sets errno to EDOM when x is NaN. 

SEE ALSO

abs(3C), isinf(3M), isnan(3M). 

STANDARDS CONFORMANCE

floor: SVID2, XPG2, XPG3, POSIX.1, FIPS 151-1, ANSI C

ceil: SVID2, XPG2, XPG3, POSIX.1, FIPS 151-1, ANSI C

fabs: SVID2, XPG2, XPG3, POSIX.1, FIPS 151-1, ANSI C

fmod: SVID2, XPG2, XPG3, POSIX.1, FIPS 151-1, ANSI C

Hewlett-Packard Company  —  HP-UX Release 7.0: Sept 1989