copysign - Online Linux Manual PageSection : 3
Updated : 2023-02-05
Source : Linux man-pages 6.03

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NAMEcopysign, copysignf, copysignl − copy sign of a number

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LIBRARYMath library (libm, −lm)

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SYNOPSIS#include <math.h>double copysign(double x, double y); float copysignf(float x, float y); long double copysignl(long double x, long double y);Feature Test Macro Requirements for glibc (see feature_test_macros(7)): copysign(), copysignf(), copysignl(): _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L || /* Since glibc 2.19: */ _DEFAULT_SOURCE || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE

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DESCRIPTIONThese functions return a value whose absolute value matches that of x, but whose sign bit matches that of y. For example, copysign(42.0, −1.0)" and copysign(−42.0, −1.0)" both return −42.0.

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RETURN VALUEOn success, these functions return a value whose magnitude is taken from x and whose sign is taken from y. If x is a NaN, a NaN with the sign bit of y is returned.

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ERRORSNo errors occur.

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ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7). InterfaceAttributeValue copysign(), copysignf(), copysignl() Thread safetyMT-Safe

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STANDARDSC99, POSIX.1-2001, POSIX.1-2008. This function is defined in IEC 559 (and the appendix with recommended functions in IEEE 754/IEEE 854).

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NOTESOn architectures where the floating-point formats are not IEEE 754 compliant, these functions may treat a negative zero as positive.

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SEE ALSOsignbit(3) 0

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