HP-UX Reference (11i v2 04/09) - 3 Library Functions A-M (vol 6)

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fabs(3M) fabs(3M)

NAME

fabs( ), fabsf( ), fabsl( ), fabsw( ), fabsq( ) - absolute value functions

SYNOPSIS

#include <math.h>

double fabs(double x);

float fabsf(float x);

Itanium(R)-based System Only

long double fabsl(long double x);

extended fabsw(extended x);

quad fabsq(quad x);

DESCRIPTION

The fabs() function returns the absolute value of x,|x|.

fabsf() is a float version of fabs(); it takes a

float argument and returns a float result.

Itanium-based System Only

fabsl() is a long double version of fabs(); it takes a long double argument and returns a

long double result.

fabsw() is an extended version of fabs(); it takes an extended argument and returns an

extended result.

fabsq() is equivalent to fabsl() on HP-UX systems.

USAGE

To use

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

option. For PA-RISC only,

the

-D_HPUX_SOURCE option must be used along with the

-Aa option.

To use (for Itanium-based systems)

fabsl(), fabsw(),orfabsq(), compile either with the default

-Ae option or with the -Aa and -D_HPUX_SOURCE

options. To use fabsw() or fabsq(), compile

with the

-fpwidetypes option.

To use these functions, make sure your program includes

<math.h>, and link in the math library by

specifying -lm on the compiler or linker command line.

For more information, see the HP-UX Floating-Point Guide.

RETURN VALUE

If x is ±INFINITY, fabs() returns +INFINITY.

If x is NaN,

fabs() returns NaN.

These functions raise no exceptions.

ERRORS

No errors are deﬁned.