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copysign (3)
  • copysign (3) ( Solaris man: Библиотечные вызовы )
  • copysign (3) ( FreeBSD man: Библиотечные вызовы )
  • copysign (3) ( Русские man: Библиотечные вызовы )
  • >> copysign (3) ( Linux man: Библиотечные вызовы )
  • copysign (3) ( POSIX man: Библиотечные вызовы )
  •  

    NAME

    copysign, copysignf, copysignl - copy sign of a number
     
    

    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);

    Link with -lm.

    Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

    copysign(), copysignf(), copysignl(): _SVID_SOURCE || _BSD_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE; or cc -std=c99  

    DESCRIPTION

    The copysign() functions return a value whose absolute value matches that of x, but whose sign bit matches that of y.  

    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.  

    CONFORMING TO

    C99, POSIX.1-2001. This function is defined in IEC 559 (and the appendix with recommended functions in IEEE 754/IEEE 854).  

    NOTES

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

    SEE ALSO

    signbit(3)  

    COLOPHON

    This page is part of release 3.14 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUE
    ERRORS
    CONFORMING TO
    NOTES
    SEE ALSO
    COLOPHON


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