# BigInteger bitLength() Method in Java

• Last Updated : 04 Dec, 2018

The java.math.BigInteger.bitLength() method returns the number of bits in the minimal two’s-complement representation of this BigInteger, excluding a sign bit. For positive BigIntegers, this is equivalent to the number of bits in the ordinary binary representation. The bitLength method Computes (ceil(log2(this < 0 ? -this : this+1))).

Syntax:

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`public int bitLength()`

Parameters: The method deoes not return any parameters.

Return Value: The method is used to return the number of bits in the minimal two’s-complement representation of this BigInteger, excluding a sign bit.

Examples:

```Input: value = 2300
Output: 12
Explanation:
Binary signed 2's complement of 2300 = 0000100011111100
first four bits are singed bit so exclude them then remaining
no of bits = 12. So bitLength in 0000100011111100 = 12.

Input: value = 5482549
Output: 23
```

Below program illustrates the use of bitLength() method of BigInteger.

 `// Program to demonstrate bitLength() method of BigInteger `` ` `import` `java.math.*;`` ` `public` `class` `GFG {`` ` `    ``public` `static` `void` `main(String[] args)``    ``{`` ` `        ``// Create  BigInteger objects``        ``BigInteger biginteger = ``new` `BigInteger(``"2300"``);`` ` `        ``// Call bitLength() method on bigInteger``        ``int` `count = biginteger.bitLength();`` ` `        ``String result = ``"bitLength of  "` `+ biginteger +``        ``" is "` `+ count;`` ` `        ``// Print result``        ``System.out.println(result);``    ``}``}`
Output:
```bitLength of  2300 is 12
```
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