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FreeBSD 11.0 - man page for fdim (freebsd section 3)

FDIM(3) 						   BSD Library Functions Manual 						   FDIM(3)

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 if 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.
BSD
June 29, 2004 BSD

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