FABS(3) BSD Library Functions Manual FABS(3)NAME
fabs, fabsf, fabsl -- floating-point absolute value functions
LIBRARY
Math Library (libm, -lm)
SYNOPSIS
#include <math.h>
double
fabs(double x);
float
fabsf(float x);
long double
fabsl(long double x);
DESCRIPTION
The fabs(), fabsf() and fabsl() functions compute the absolute value of a floating-point number x.
RETURN VALUES
The fabs(), fabsf() and fabsl() functions return the absolute value of x.
SEE ALSO abs(3), ceil(3), floor(3), ieee(3), math(3), rint(3)STANDARDS
The fabs() function conforms to ISO/IEC 9899:1990 (``ISO C90''). The fabsf() and fabsl() functions conform to ISO/IEC 9899:1999
(``ISO C99'').
BSD October 25, 2003 BSD
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FABS(3) Linux Programmer's Manual FABS(3)NAME
fabs, fabsf, fabsl - absolute value of floating-point number
SYNOPSIS
#include <math.h>
double fabs(double x);
float fabsf(float x);
long double fabsl(long double x);
Link with -lm.
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
fabsf(), fabsl():
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
or cc -std=c99
DESCRIPTION
These functions return the absolute value of the floating-point number x.
RETURN VALUE
These functions return the absolute value of x.
If x is a NaN, a NaN is returned.
If x is -0, +0 is returned.
If x is negative infinity or positive infinity, positive infinity is returned.
ERRORS
No errors occur.
ATTRIBUTES
Multithreading (see pthreads(7))
The fabs(), fabsf(), and fabsl() functions are thread-safe.
CONFORMING TO
C99, POSIX.1-2001. The variant returning double also conforms to SVr4, 4.3BSD, C89.
SEE ALSO abs(3), cabs(3), ceil(3), floor(3), labs(3), rint(3)COLOPHON
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
2013-07-10 FABS(3)
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