NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | CONFORMING TO | SEE ALSO | COLOPHON

The Linux Programming Interface

FABS(3)                       Linux Programmer's Manual                       FABS(3)

NAME         top

       fabs, fabsf, fabsl - absolute value of floating-point number

SYNOPSIS         top

       #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         top

       The fabs() functions return the absolute value of the floating-point number x.

RETURN VALUE         top

       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         top

       No errors occur.

CONFORMING TO         top

       C99, POSIX.1-2001.  The variant returning double also conforms to SVr4,
       4.3BSD, C89.

SEE ALSO         top

       abs(3), cabs(3), ceil(3), floor(3), labs(3), rint(3)

COLOPHON         top

       This page is part of release 3.32 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/.

                                      2010-09-20                              FABS(3)

HTML rendering created 2010-12-03 by Michael Kerrisk, author of The Linux Programming Interface