fdimf man page on SunOS

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fdim(3M)		Mathematical Library Functions		      fdim(3M)

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

SYNOPSIS
       c99 [ flag... ] file... -lm [ library... ]
       #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 determine the positive difference between  their	 argu‐
       ments.  If  x  is greater than y, x−y is returned. If x is less than or
       equal to y, +0 is returned.

RETURN VALUES
       Upon successful completion, these functions return the positive differ‐
       ence value.

       If  x−y	is  positive  and  overflows, a range error occurs and fdim(),
       fdimf(),	 and  fdiml()  returns	the  value  of	the  macro   HUGE_VAL,
       HUGE_VALF, and HUGE_VALL, respectively.

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

ERRORS
       These functions will fail if:

       Range Error     The result overflows.

		       If   the	  integer   expression	 (math_errhandling   &
		       MATH_ERREXCEPT) is  non-zero,  the  overflow  floating-
		       point exception will be raised.

USAGE
       An  application	wanting to check for exceptions should call feclearex‐
       cept(FE_ALL_EXCEPT) before  calling  these  functions.  On  return,  if
       fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is
       non-zero, an exception has been raised. An  application	should	either
       examine the return value or check the floating point exception flags to
       detect exceptions.

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       ┌─────────────────────────────┬─────────────────────────────┐
       │      ATTRIBUTE TYPE	     │	    ATTRIBUTE VALUE	   │
       ├─────────────────────────────┼─────────────────────────────┤
       │Interface Stability	     │Standard			   │
       ├─────────────────────────────┼─────────────────────────────┤
       │MT-Level		     │MT-Safe			   │
       └─────────────────────────────┴─────────────────────────────┘

SEE ALSO
       feclearexcept(3M), fetestexcept(3M), fmax(3M), fmin(3M), math.h(3HEAD),
       attributes(5), standards(5)

SunOS 5.10			  12 Jul 2006			      fdim(3M)
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