Name

signbit
- test sign of a real floating point number

Library

 libm.lib

Synopsis
  #include <math.h>
  int signbit (real-floating x);

Detailed description

 The signbit macro takes an argument of x and returns non-zero if the value of its sign is negative, otherwise 0.

Examples

 
#include <math.h>
int main( )
{
   double x1 = 0.0, x2 = -4.0 ;
   int y;  
   y = signbit( x1);
   printf( "signbit( %f)  = %d\n", x1,  y );  
   y = signbit( x2);
   printf( "signbit( %f)  = %d\n", x2,  y );
}

Output 

signbit ( 0.0 ) = 0
signbit( -4.0 ) = 1

See also

 fpclassify, math

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