NAME
fdim, fdimf,
fdiml —
positive difference
functions
LIBRARY
library “libm”
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
Thefdim(),
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
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.