Manual Pages  — FDIM

fdim, fdimf, fdiml – positive difference functions

LIBRARY SYNOPSIS DESCRIPTION SEE ALSO STANDARDS HISTORY

Math Library (libm, -lm)

#include <math.h>

double
fdim(double x, double y);

float
fdimf(float x, float y);

long double
fdiml(long double x, long double y);

The fdim(), fdimf(), and fdiml() functions return the positive difference between x and y. That is, if x-, Ns, Fa, y is positive, then x-, Ns, Fa, 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 if the exact result is not representable in the return type. No other exceptions are raised.

The fdim(), fdimf(), and fdiml() functions conform to ISO/IEC 9899:1999 ("ISO C99").

These routines first appeared in FreeBSD 5.3 .