fabs(3) - Linux manual page (original) (raw)

fabs(3) Library Functions Manual fabs(3)

NAME top

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

LIBRARY top

   Math library (_libm_, _-lm_)

SYNOPSIS top

   **#include <math.h>**

   **double fabs(double** _x_**);**
   **float fabsf(float** _x_**);**
   **long double fabsl(long double** _x_**);**

Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

   **fabsf**(), **fabsl**():
       _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
           || /* Since glibc 2.19: */ _DEFAULT_SOURCE
           || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE

DESCRIPTION top

   These 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.

ATTRIBUTES top

   For an explanation of the terms used in this section, see
   [attributes(7)](../man7/attributes.7.html).
   ┌──────────────────────────────────────┬───────────────┬─────────┐
   │ **Interface** │ **Attribute** │ **Value** │
   ├──────────────────────────────────────┼───────────────┼─────────┤
   │ **fabs**(), **fabsf**(), **fabsl**()             │ Thread safety │ MT-Safe │
   └──────────────────────────────────────┴───────────────┴─────────┘

STANDARDS top

   C11, POSIX.1-2008.

HISTORY top

   C99, POSIX.1-2001.

   The variant returning _double_ also conforms to SVr4, 4.3BSD, C89.

SEE ALSO top

   [abs(3)](../man3/abs.3.html), [cabs(3)](../man3/cabs.3.html), [ceil(3)](../man3/ceil.3.html), [floor(3)](../man3/floor.3.html), [labs(3)](../man3/labs.3.html), [rint(3)](../man3/rint.3.html)

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Linux man-pages 6.10 2024-07-23 fabs(3)

Pages that refer to this page:abs(3)