Mathematical Library Functions                        signbit(3M)



NAME
     signbit - test sign

SYNOPSIS
     c99 [ flag... ] file... -lm [ library... ]
     #include 

     int signbit(real-floating x);


DESCRIPTION
     The signbit() macro determines whether the sign of its argu-
     ment  value  is negative. NaNs, zeros, and infinities have a
     sign bit.

RETURN VALUES
     The signbit() macro returns a non-zero value if and only  if
     the sign of its argument value is negative.

ERORS
     No errors are defined.

ATRIBUTES
     See attributes(5) for descriptions of the  following  attri-
     butes:



     
           ATRIBUTE TYPE               ATRIBUTE VALUE       
    
     Interface Stability          Standard                    
    
     MT-Level                     MT-Safe                     
    


SEE ALSO
     fpclassify(3M),    isfinite(3M),    isinf(3M),    isnan(3M),
     isnormal(3M), math.h(3HEAD), attributes(5), standards(5)















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