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    Command:

    signbit

    
    
    

    SYNOPSIS

           #include <math.h>
    
           int signbit(x);
    
           Link with -lm.
    
       Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
    
           signbit():
               _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE ||
               _POSIX_C_SOURCE >= 200112L;
               or cc -std=c99
    
    
    

    DESCRIPTION

           signbit() is a generic macro which can work on all real  floating-point
           types.   It  returns a nonzero value if the value of x has its sign bit
           set.
    
           This is not the same as x < 0.0, because IEEE 754 floating point allows
           zero  to  be  signed.   The  comparison  -0.0 < 0.0 is false, but sign-
           bit(-0.0) will return a nonzero value.
    
           NaNs and infinities have a sign bit.
    
    
    

    RETURN VALUE

           The signbit() macro returns nonzero if the sign of x is negative;  oth-
           erwise it returns zero.
    
    
    

    ERRORS

           No errors occur.
    
    
    

    ATTRIBUTES

       Multithreading (see pthreads(7))
           The signbit() macro is 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).
    
    
    

    SEE ALSO

           copysign(3)
    
    
    

    GNU 2013-07-04 SIGNBIT(3)

    
    
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