Java - Math copySign(double) method

---

---

Description

The Java Math copySign(double magnitude, double sign) returns the first floating-point argument with the sign of the second floating-point argument.

Declaration

Following is the declaration for java.lang.Math.copySign() method

public static double copySign(double magnitude, double sign)

Parameters

• magnitude − the parameter providing the magnitude of the result

• sign − the parameter providing the sign of the result

Return Value

This method returns a value with the magnitude of magnitude and the sign of sign.

Exception

NA

Example 1

The following example shows the usage of Math copySign() method.

package com.tutorialspoint;
public class MathDemo {
   public static void main(String[] args) {

      // get two double numbers
      double x = 125.9;
      double y = -0.4873;
   
      // print a double with the magnitude of x and the sign of y
      System.out.println("Math.copySign(" + x + "," + y + ")=" + Math.copySign(x, y));
   }
}

Output

Let us compile and run the above program, this will produce the following result −

Math.copySign(125.9, -0.4873)=-125.9

Example 2

The following example shows the another usage of Math copySign() method with swapped parameters.

package com.tutorialspoint;
public class MathDemo {
   public static void main(String[] args) {

      // get two double numbers
      double x = 125.9;
      double y = -0.4873;
   
      // print a double with the magnitude of y and the sign of x
      System.out.println("Math.copySign(" + y + "," + x + ")=" + Math.copySign(y, x));
   }
}

Output

Let us compile and run the above program, this will produce the following result −

Math.copySign(-0.4873, 125.9)=0.4873

Example 3

The following example shows the usage of Math copySign() method of a zero value.

package com.tutorialspoint;
public class MathDemo {
   public static void main(String[] args) {

      // get two double numbers
      double x = 0;
      double y = -0.4873;
   
      // print a double with the magnitude of x and the sign of y
      System.out.println("Math.copySign(" + x + "," + y + ")=" + Math.copySign(x, y));
   }
}

Output

Let us compile and run the above program, this will produce the following result −

Math.copySign(0.0,-0.4873)=-0.0