Math scalb() Method in Java

• It returns an infinity when the exponent of the result is larger than Double.MAX_EXPONENT.
• The result is NaN when the first argument is NaN.
• The result is an infinity of the same sign when the first argument is infinite.
• It returns a Zero of the same sign when the first argument is zero.

public static double scalb(double a, int scale)

• a: This is of the double type which is the number to be scaled by a power of two.
• scale: This is of integer type which is the power of 2 ,used to scale a

Input: 
a = 77.23
scale = 3

Output = 617.84

// Java praogram to illustrate the
// java.lang.Math.scalb(double a, int scale )
import java.lang.*;

public class Geeks {

    public static void main(String[] args)
    {

        double p = 52.12;
        int scale = 8;

        // It returns p x 2^scale
        System.out.print("Value of Math.scalb(" 
                     + p + ", " + scale + ") = ");
        System.out.println(Math.scalb(p, scale));
    }
}

Value of Math.scalb(52.12, 8) = 13342.72

• It returns an infinity when the exponent of the result is larger than Float.MAX_EXPONENT.
• The result is NaN when the first argument is NaN.
• The result is an infinity of the same sign when the first argument is infinite.
• It returns a Zero of the same sign when the first argument is zero.

public static double scalb(float a, int scale)

• a: This is of float type which is the number to be scaled by a power of two.
• scale: This is of integer type which refers to the power of 2 used in scaling of a

Input: 
a = 32.14f
scale = 6

Output = 2056.96

// Java praogram to illustrate the
// java.lang.Math.scalb(float a, int scale )
import java.lang.*;

public class Geeks {

    public static void main(String[] args)
    {

        float p = 81.27f;
        int scale = 8;

        // Calculate p multiplied by 2 raised in scale
        System.out.print("Value of Math.scalb(" +
                            p + ", " + scale + ") = ");
        System.out.println(Math.scalb(p, scale));
    }
}

Value of Math.scalb(81.27, 8) = 20805.12