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# BigInteger testBit() Method in Java

• Difficulty Level : Medium
• Last Updated : 04 Dec, 2018

prerequisite : BigInteger Basics
The java.math.BigInteger.testBit(index) method returns true if and only if the designated bit is set. This method Computes (this & (1<<n)) != 0).

Syntax:

`public boolean testBit(int n)`

Parameter: The method takes one parameter n of integer type which refers to the index of the bit that needs to be tested.

Return Value: The method returns true if and only if the designated bit is set else it will return false.

Exception: The method will throw an ArithmeticException when n is negative.
Examples:

```Input: BigInteger = 2300, n = 4
Output: true
Explanation:
Binary Representation of 2300 = 100011111100
bit at index 4 is 1 so set it means bit is set
so method will return true

Input: BigInteger = 5482549 , n = 1
Output: false
```

Below program illustrates the testBit() method of BigInteger.

 `// Program to demonstrate the testBit() ` `// method of BigInteger ` ` `  `import` `java.math.*; ` ` `  `public` `class` `GFG { ` ` `  `    ``public` `static` `void` `main(String[] args) ` `    ``{ ` `        ``// Creating a BigInteger object ` `        ``BigInteger biginteger = ``new` `BigInteger(``"2300"``); ` ` `  `        ``// Creating an int i for index ` `        ``int` `i = ``3``; ` ` `  `        ``boolean` `flag = biginteger.testBit(i); ` ` `  `        ``String result = ``"The bit at index "` `+ i + ``" of "` `+  ` `        ``biginteger + ``" is set = "` `+ flag; ` ` `  `        ``// Displaying the result ` `        ``System.out.println(result); ` `    ``} ` `} `

Output:

```The bit at index 3 of 2300 is set = true
```
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