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FDIM(3) 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 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. NetBSD 8.99.34 June 29, 2004 NetBSD 8.99.34