FDIM(3) Library Functions Manual FDIM(3)

fdim, fdimf, fdiml — positive difference functions

#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 (), (), and () 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 if the exact result is not representable in the return type. No other exceptions are raised.

fabs(3), fmax(3), fmin(3)

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

These routines first appeared in OpenBSD 4.5.

April 26, 2016 OpenBSD 7.6