NAME
fdim,
fdimf,
fdiml —
positive difference functions
LIBRARY
Math Library (libm, -lm)
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
The
fdim(),
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
fabs(3),
fmax(3),
fmin(3),
math(3)
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.