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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:

 `// 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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