fdim(3) [netbsd man page]

FDIM(3) 						   BSD Library Functions Manual 						   FDIM(3)

NAME

     fdim, fdimf, fdiml -- positive difference functions

LIBRARY

     Math Library (libm, -lm)

SYNOPSIS

     #include <math.h>

     double
     fdim(double x, double y);

     float
     fdimf(float x, float y);

     long double
     fdiml(long double x, long double y);

DESCRIPTION

     The fdim(), fdimf(), and fdiml() functions return the positive difference between x and y.  That is, if x-y is positive, then x-y is
     returned.	If either x or y is an NaN, then an NaN is returned.  Otherwise, the result is +0.0.

     Overflow or underflow may occur iff the exact result is not representable in the return type.  No other exceptions are raised.

SEE ALSO

     fabs(3), fmax(3), fmin(3), math(3)

STANDARDS

     The fdim(), fdimf(), and fdiml() functions conform to ISO/IEC 9899:1999 (``ISO C99'').

HISTORY

     These routines first appeared in FreeBSD 5.3 and NetBSD 5.1.

BSD
								   June 29, 2004							       BSD

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

NAME

       fdim, fdimf, fdiml - positive difference

SYNOPSIS

       #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():
	   _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
	   or cc -std=c99

DESCRIPTION

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

RETURN VALUE

       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

       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
	      An overflow floating-point exception (FE_OVERFLOW) is raised.

       These functions do not set errno.

VERSIONS

       These functions first appeared in glibc in version 2.1.

ATTRIBUTES

   Multithreading (see pthreads(7))
       The fdim(), fdimf(), and fdiml() functions are thread-safe.

CONFORMING TO

       C99, POSIX.1-2001.

SEE ALSO

       fmax(3)

COLOPHON

       This  page is part of release 3.53 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/.

								    2013-07-15								   FDIM(3)