# BigInteger bitLength() Method in Java

Last Updated : 26 Apr, 2023

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:

`public int bitLength()`

Parameters: The method does 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 signed bit so exclude them than 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.

## Java

 `// 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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