FABS(3) BSD Library Functions Manual FABS(3)NAME
fabs, fabsf -- floating-point absolute value function
LIBRARY
Math Library (libm, -lm)
SYNOPSIS
#include <math.h>
double
fabs(double x);
float
fabsf(float x);
DESCRIPTION
The fabs() and fabsf() functions compute the absolute value of a floating-point number x.
RETURN VALUES
The fabs() function returns the absolute value of x.
SEE ALSO abs(3), ceil(3), floor(3), math(3), rint(3)STANDARDS
The fabs() function conforms to ANSI X3.159-1989 (``ANSI C89'').
BSD May 2, 1991 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; or cc -std=c99
DESCRIPTION
The fabs() 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.
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 3.25 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/.
2008-08-05 FABS(3)

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