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BigInteger bitLength() Method in Java
  • Last Updated : 04 Dec, 2018
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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 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

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

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