Math scalb() Method in Java

1. The scalb(double a, int scale ) is an inbuilt method of Math class in Java which is used to get the value a x 2^scale . The result is accurately calculated when the exponent of the result is between Double.MIN_EXPONENT and Double.MAX_EXPONENT. It gives rise to four special results:
   • 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.

   Syntax :

   public static double scalb(double a, int scale)

   Parameters : This method accepts two parameters they are:

   • 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

   Return Value : The method returns a x 2^scale
   Examples :

   Input: 
   a = 77.23
   scale = 3
   
   Output = 617.84
   

   Below program illustrates the java.lang.Math.scalb(double a, int scale) method:

   // 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));
       }
   }
   Output:

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

2. The java.lang.Math.scalb(float a, int scale ) is an inbuilt method which returns a x 2^scale . The result is accurately calculated when the exponent of the result is between Float.EXPONENT and Float.MAX_EXPONENT.
   • 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.

   Syntax :

   public static double scalb(float a, int scale)

   Parameters : This method accepts two parameters:

   • 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

   Return Value : The method returns a x 2^scale
   Examples :

   Input: 
   a = 32.14f
   scale = 6
   
   Output = 2056.96
   

   Below program illustrates the java.lang.Math.scalb(float a, int scale ) method:
   Program 1:

   // 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));
       }
   }
   Output:

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