Man page - copysignl(3)

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Manual

copysign

NAME
LIBRARY
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
ATTRIBUTES
VERSIONS
STANDARDS
HISTORY
SEE ALSO

NAME

copysign, copysignf, copysignl - copy sign of a number

LIBRARY

Math library ( libm , -lm )

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

DESCRIPTION

These 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.

RETURN VALUE

On 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.

ERRORS

No errors occur.

ATTRIBUTES

For an explanation of the terms used in this section, see attributes (7).

Image grohtml-329475-1.png

VERSIONS

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

STANDARDS

C11, POSIX.1-2008.

This function is defined in IEC 559 (and the appendix with recommended functions in IEEE 754/IEEE 854).

HISTORY

C99, POSIX.1-2001, 4.3BSD.

SEE ALSO

signbit (3)