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