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BigInteger bitCount() Method in Java
  • Last Updated : 03 Feb, 2021
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Prerequisite: BigInteger Basics 
The java.math.BigInteger.bitCount() method returns number of bits in the two’s complement representation of this BigInteger that differ from its sign bit. This method is useful when implementing bit-vector style sets atop BigIntegers.
Syntax: 
 

public int bitCount()

Parameters: The method does not take any parameters.
Return Value: The method is used to return the number of bits in the two’s complement representation of this BigInteger that differ from its sign bit.
Examples: 
 

Input: value = 2300 
Output: 7
Explanation:
Binary signed 2's complement of 2300 = 0000100011111100
Singned bit is 0 because 2300 is positive
so no of 1 in 0000100011111100 is bitCount
So bitCount in 0000100011111100 = 7

Input: value = 5482549
Output: 11

Below program illustrate the bitCount() method of BigInteger. 
 

Java




/*
*Program Demonstrate bitCount() method of BigInteger
*/
import java.math.*;
 
public class GFG {
 
    public static void main(String[] args)
    {
 
        // Creates  BigInteger objects
        BigInteger biginteger = new BigInteger("2300");
 
        // Calling bitCount() method on bigInteger
        int count = biginteger.bitCount();
 
        String result = "BitCount of  " + biginteger + " is " + count;
 
        // Print result
        System.out.println(result);
    }
}
Output: 
BitCount of  2300 is 7

 

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

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