NAME
fdim() — positive difference function
SYNOPSIS
#include <math.h>
double fdim(double x, double y);
DESCRIPTION
The
fdim()
function determines the positive difference between its arguments.
The ISO/ANSI C committee has approved the
fdim()
function for inclusion in the C9X draft standard.
To use this function, compile either with the default
-Ae
option or with the
-Aa
and
-D_HPUX_SOURCE
options. Make sure your program includes
<math.h>.
Link in the math library by specifying
-lm
on the compiler or linker command line.
RETURN VALUE
The
fdim()
function returns the positive difference between
x
and
y.
If
x
>
y,
fdim()
returns
x
-
y.
If
x
<=
y,
fdim()
returns +zero.
If
x
or
y
is NaN,
fdim()
returns the same NaN.
If both arguments are NaNs,
fdim()
returns one of the arguments.
If the correct value would overflow,
fdim()
returns +INFINITY.
ERRORS
No errors are defined.
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