Manpages - fdim.3

fdim, fdimf, fdiml - positive difference

  #include <math.h>

  double fdim(double x, double y);
  float fdimf(float x, float y);
  long double fdiml(long double x, long double y);

Link with -lm.

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

*fdimf*(), *fdiml*():

      _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L

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

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.

See *math_error*(7) 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 is set to ERANGE. An overflow floating-point exception (FE_OVERFLOW) is raised.

These functions first appeared in glibc in version 2.1.

For an explanation of the terms used in this section, see *attributes*(7).

C99, POSIX.1-2001, POSIX.1-2008.

Before glibc version 2.24 on certain architectures (e.g., x86, but not x86_64) these functions did not set errno.

*fmax*(3)

This page is part of release 5.13 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.