BigInteger bitLength() Method in Java

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

Reference:https://docs.oracle.com/javase/7/docs/api/java/math/BigInteger.html#bitLength()

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