floor.3m (2010 09)

ﬂoor(3M) ﬂoor(3M)

NAME

ﬂoor( ), ﬂoorf( ), ﬂoorl( ), ﬂoorw( ), ﬂoorq( ) - ﬂoor functions

SYNOPSIS

#include <math.h>

double floor(double x);

HP Integrity Server Only

float floorf(float x);

long double floorl(long double x);

extended floorw(extended x);

quad floorq(quad x);

DESCRIPTION

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

Integrity Server Only

floorf() is a float version of floor(); it takes a

float argument and returns a float result.

floorl() is a long double version of floor(); it takes a long double argument and returns a

long double result.

floorw() is an extended version of floor(); it takes an extended argument and returns an

extended result.

floorq() is equivalent to floorl() on HP-UX systems.

USAGE

To use (for Integrity servers)

floorf(), compile either with the default -Ae option or with the

-Aa

option.

To use (for Integrity servers)

floorl(), floorw(),orfloorq(), compile either with the default

-Ae

option or with the -Aa and -D_HPUX_SOURCE

options.

To use (for Integrity servers)

floorw() or floorq(), compile also with the -fpwidetypes

option.

To use these functions, make sure your program includes

<math.h>. Link in the math library by speci-

fying -lm on the compiler or linker command line.

For more information, see the HP-UX ﬂoating-point guide for HP Integrity servers at the following site:

http://www.hp.com/go/fp

RETURN VALUE

If x is ±INFINITY or ±zero,

floor() returns x.

If x is NaN,

floor() returns NaN.

floor() may raise the inexact exception if x is non integral and ﬁnite.

ERRORS

No errors are deﬁned.