Java Math copySign() Method

The copySign() method of Math class returns the first floating-point argument with the sign of the second argument.

Syntax:

public static float copySign(float magnitude, float sign)

public static double copySign(double magnitude, double sign)

Parameters:

The parameter ‘magnitude’ and ‘sign’ represents the magnitude and sign of the result.

Return Value:

The copySign() method returns a value with the magnitude of magnitude and the sign of sign.

Example 1:

public class JavaMathCopySignExample1 {
    public static void main(String[] args) {
        double a=8.1;
        double b=-1;
        //returns a value with the magnitude of 'a' and the sign of 'b'.
        System.out.println("Sign and magnitude of "+ a +" : "+Math
.copySign(a,b));
    }
}

Output:

Sign and magnitude of 8.1 : -8.1

Example 2:

public class JavaMathCopySignExample2 {
    public static void main(String[] args) {
        double a=-0.0d/0.0d;
        double b=-24;
        //return NaN value
        System.out.println("Sign for "+ a +" value : "+Math.copySign(a,b));
    }
}

Output:

Sign for NaN value : NaN

Example 3:

public class JavaMathCopySignExample3 {
    public static void main(String[] args) {
        float a=-0.0f;
        float b=3;
        //Returns the first floating-point argument with the sign of
the second floating-point argument
        System.out.println("Sign and magnitude of "+ a +" = "+Math
.copySign(a,b));
    }
}

Output:

Sign and magnitude of -0.0 = 0.0

Example 4:

public class JavaMathCopySignExample4 {
    public static void main(String[] args) {
        double x = -90d/0.0d;
        double y=9;
        System.out.println("Sign and magnitude = "+Math.copySign(x,y));
    }
}

Output:

Sign and magnitude = Infinity