Java - Math copySign(float) Method

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Description

The Java Math copySign(float magnitude, float 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 float copySign(float magnitude, float 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

Getting First Float Argument Copied Sign of Second Positive Float Argument Example

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

package com.tutorialspoint;

public class MathDemo {

   public static void main(String[] args) {

      // get two float numbers
      float x = 125.9f;
      float y = -0.4873f;
   
      // print a float 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

Getting First Float Argument Copied Sign of Second Negative Float Argument Example

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 float numbers
      float x = 125.9f;
      float y = -0.4873f;
   
      // print a float 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

Getting Zero Copied Sign of Second Float Argument Example

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 float numbers
      float x = 0f;
      float y = -0.4873f;
   
      // print a float 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