fdim - Online Linux Manual PageSection : 3
Updated : 2023-01-07
Source : Linux man-pages 6.03

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NAMEfdim, fdimf, fdiml − positive difference

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LIBRARYMath library (libm, −lm)

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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);Feature Test Macro Requirements for glibc (see feature_test_macros(7)): fdimf(), fdiml(): _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L

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DESCRIPTIONThese functions return the positive difference, max(x-y,0), between their arguments.

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RETURN VALUEOn success, these functions return the positive difference. If x or y is a NaN, a NaN is returned. If the result overflows, a range error occurs, and the functions return HUGE_VAL, HUGE_VALF, or HUGE_VALL, respectively.

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ERRORSSee math_error(7) for information on how to determine whether an error has occurred when calling these functions. The following errors can occur: Range error: result overflow  errno is set to ERANGE. An overflow floating-point exception (FE_OVERFLOW) is raised.

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VERSIONSThese functions were added in glibc 2.1.

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ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7). InterfaceAttributeValue fdim(), fdimf(), fdiml() Thread safetyMT-Safe

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STANDARDSC99, POSIX.1-2001, POSIX.1-2008.

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BUGSBefore glibc 2.24 on certain architectures (e.g., x86, but not x86_64) these functions did not set errno.

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SEE ALSOfmax(3) 0

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