HP-UX Reference (11i v1 05/09) - 3 Library Functions A-M (vol 6)

fdim(3M) fdim(3M)

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.