copysign

Name

copysign, copysignf, copysignl,
- copy sign of a number

Library

libm.lib

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);

Detailed description

The copysign, copysignf, and copysignl functions return x with its sign changed to y ’s.

Examples

#include <math.h>
void main( void )
{
   double x1 = 0, x2 = -4, y;
   y = copysign( x1, x2 );
   printf( "copysign(%f , %f) = %f\n", x1, x2, y );
   y = copysignf( x1, x2 );
   printf( "copysignf(%f , %f) = %f\n", x1, x2, y );
   y = copysignl( x1, x2 );
   printf( "copysignl(%f , %f) = %f\n", x1, x2, y );
}

Output

copysign ( 0, -4 ) = -0.0
copysignf( 0, -4 ) = -0.0
copysignl( 0, -4 ) = -0.0

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