# 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
```

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