Java.math.BigInteger.getLowestSetBit() Method

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Description

The java.math.BigInteger.getLowestSetBit() returns the index of the rightmost (lowest-order) one bit in this BigInteger (the number of zero bits to the right of the rightmost one bit). It returns -1 if this BigInteger contains no one bits. It computes (this==0? -1 : log2(this & -this)).

Declaration

Following is the declaration for java.math.BigInteger.getLowestSetBit() method

public int getLowestSetBit()

Parameters

  • NA

Return Value

This method returns the index of the rightmost one bit in this BigInteger.

Exception

  • NA

Example

The following example shows the usage of math.BigInteger.getLowestSetBit() method

package com.tutorialspoint;

import java.math.*;

public class BigIntegerDemo {

public static void main(String[] args) {

        // create 2 BigInteger objects
	BigInteger bi1, bi2;

	// create 2 int objects
	int i1, i2;

	// assign values to bi1, bi2
	bi1 = new BigInteger("8");//1000
	bi2 = new BigInteger("7");//0111

	// perform getLowestSetBit on bi1, bi2
	i1 = bi1.getLowestSetBit();
	i2 = bi2.getLowestSetBit();

	String str1 = "Index of rightmost one bit in " +bi1+ " is " +i1;
	String str2 = "Index of rightmost one bit in " +bi2+ " is " +i2;

	// print i1, i2 values
	System.out.println( str1 );
	System.out.println( str2 );
    }
}

Let us compile and run the above program, this will produce the following result:

Index of rightmost one bit in 8 is 3
Index of rightmost one bit in 7 is 0



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