BigInteger clearBit() Method in Java

Prerequisite: BigInteger Basics

The clearBit() method returns a BigInteger which is used to clear a particular bit position in a BigInteger. The bit at index n of binary representaion of BigInteger will be cleared means converted to zero. Mathematically we can say that it is used to calculate this & ~(1<<n).

Syntax:



public BigInteger clearBit(int n)

Parameter: The method takes one parameter n which refers to the index of the bit needed to be cleared.

Return Value: The method returns the BigInteger after clearing the bit position n.

Throws: The method might throw an ArithmeticException when n is negative.

Examples:

Input: value = 2300, index = 3
Output: 2292
Explanation:
Binary Representation of 2300 = 100011111100
bit at index 3 is 1 so clear the bit at index 3 
Now Binary Representation becomes 100011110100
and Decimal equivalent of 100011110100 is 2292

Input: value = 5482549, index = 0
Output: 5482548

Below program illustrate the clearBit(index) method of BigInteger().

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/*
*Program Demonstrate clearBit() method of BigInteger 
*/
import java.math.*;
  
public class GFG {
  
    public static void main(String[] args)
    {
  
        // Creating  BigInteger object
        BigInteger biginteger = new BigInteger("5482549");
  
        // Creating an int i for index
        int i = 0;
  
        // Call clearBit() method on bigInteger at index i
        // store the return BigInteger
        BigInteger changedvalue = biginteger.clearBit(i);
  
        String result = "After applying clearbit at index "
        i + " of " + biginteger+" New Value is " + changedvalue;
  
        // Print result
        System.out.println(result);
    }
}

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Output:

After applying clearbit at index 0 of 5482549 New Value is 5482548

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



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