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

fdim(3) Library Functions Manual fdim(3)

NAME top

   fdim, fdimf, fdiml - positive difference

LIBRARY top

   Math library (_libm_, _-lm_)

SYNOPSIS top

   **#include <math.h>**

   **double fdim(double** _x_**, double** _y_**);**
   **float fdimf(float** _x_**, float** _y_**);**
   **long double fdiml(long double** _x_**, long double** _y_**);**

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

   **fdimf**(), **fdiml**():
       _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L

DESCRIPTION top

   These functions return the positive difference, max(_x_-_y_,0),
   between their arguments.

RETURN VALUE top

   On success, these functions return the positive difference.

   If _x_ or _y_ is a NaN, a NaN is returned.

   If the result overflows, a range error occurs, and the functions
   return **HUGE_VAL**, **HUGE_VALF**, or **HUGE_VALL**, respectively.

ERRORS top

   See [math_error(7)](../man7/math%5Ferror.7.html) for information on how to determine whether an
   error has occurred when calling these functions.

   The following errors can occur:

   Range error: result overflow
          _[errno](../man3/errno.3.html)_ is set to **ERANGE**.  An overflow floating-point
          exception (**FE_OVERFLOW**) is raised.

ATTRIBUTES top

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

STANDARDS top

   C11, POSIX.1-2008.

HISTORY top

   glibc 2.1.  C99, POSIX.1-2001.

BUGS top

   Before glibc 2.24 on certain architectures (e.g., x86, but not
   x86_64) these functions did not set _[errno](../man3/errno.3.html)_.

SEE ALSO top

   [fmax(3)](../man3/fmax.3.html)

COLOPHON top

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

Pages that refer to this page:fmax(3), fmin(3)