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Math scalb() Method in Java
  • Last Updated : 30 Jul, 2018
  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:



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    // 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));
        }
    }

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    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:

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    // 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));
        }
    }

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    Output:

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

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