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    Command:

    copysign

    
    
    

    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 || _POSIX_C_SOURCE >= 200112L;
               or cc -std=c99
    
    
    

    DESCRIPTION

           The copysign(), copysignf(), and copysignl() 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

       Multithreading (see pthreads(7))
           The copysign(), copysignf(), and copysignl() functions are thread-safe.
    
    
    

    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 com-
           pliant, these functions may treat a negative zero as positive.
    
    
    

    SEE ALSO

           signbit(3)
    
    
    

    GNU 2013-10-14 COPYSIGN(3)

    
    
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