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FDIM(P)			   POSIX Programmer's Manual		       FDIM(P)

NAME
       fdim,  fdimf, fdiml - compute positive difference between two floating-
       point numbers

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
       These functions shall determine the positive difference	between	 their
       arguments.  If x is greater than y, x- y is returned. If x is less than
       or equal to y, +0 is returned.

       An application wishing to check for error situations should  set	 errno
       to  zero	 and  call  feclearexcept(FE_ALL_EXCEPT)  before calling these
       functions.  On return, if errno is non-zero or  fetestexcept(FE_INVALID
       |  FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is non-zero, an error has
       occurred.

RETURN VALUE
       Upon successful completion, these functions shall return	 the  positive
       difference value.

       If  x-  y  is  positive	and  overflows,	 a range error shall occur and
       fdim(), fdimf(), and fdiml()  shall  return  the	 value	of  the	 macro
       HUGE_VAL, HUGE_VALF, and HUGE_VALL, respectively.

       If x- y is positive and underflows, a range error may occur, and either
       ( x- y) (if representable),  or 0.0 (if supported),  or an  implementa‐
       tion-defined value shall be returned.

       If x or y is NaN, a NaN shall be returned.

ERRORS
       The fdim() function shall fail if:

       Range Error
	      The result overflows.

       If  the integer expression (math_errhandling & MATH_ERRNO) is non-zero,
       then errno  shall  be  set  to  [ERANGE].  If  the  integer  expression
       (math_errhandling  &  MATH_ERREXCEPT)  is  non-zero,  then the overflow
       floating-point exception shall be raised.

       The fdim() function may fail if:

       Range Error
	      The result underflows.

       If the integer expression (math_errhandling & MATH_ERRNO) is  non-zero,
       then  errno  shall  be  set  to	[ERANGE].  If  the  integer expression
       (math_errhandling & MATH_ERREXCEPT) is  non-zero,  then	the  underflow
       floating-point exception shall be raised.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       On implementations supporting IEEE Std 754-1985, x- y cannot underflow,
       and hence the 0.0 return value is shaded as an extension for  implemen‐
       tations supporting the XSI extension rather than an MX extension.

       On   error,   the   expressions	(math_errhandling  &  MATH_ERRNO)  and
       (math_errhandling & MATH_ERREXCEPT) are independent of each other,  but
       at least one of them must be non-zero.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       feclearexcept()	,  fetestexcept() , fmax() , fmin() , the Base Defini‐
       tions volume of IEEE Std 1003.1-2001, Section 4.18, Treatment of	 Error
       Conditions for Mathematical Functions, <math.h>

COPYRIGHT
       Portions	 of  this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
       --  Portable  Operating	System	Interface (POSIX), The Open Group Base
       Specifications Issue 6, Copyright (C) 2001-2003	by  the	 Institute  of
       Electrical  and	Electronics  Engineers, Inc and The Open Group. In the
       event of any discrepancy between this version and the original IEEE and
       The  Open Group Standard, the original IEEE and The Open Group Standard
       is the referee document. The original Standard can be  obtained	online
       at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group		     2003			       FDIM(P)
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