Integer lowestOneBit() Method in Java - GeeksforGeeks

13 Dec, 2021
The Integer.lowestOneBit() method of java.lang is an inbuilt function that returns an int value with at most a single one-bit, in the position of the lowest-order (ie.rightmost) one-bit in the specified int value. This method will return zero if the specified value has no one-bits in its two’s complement binary representation, ie. if the binary representation of the number is equal to zero.Syntax: 
public static int lowestOneBit(int a)
Parameters: The method takes one parameter a of integer type that refers to the value whose lowest order bit is to be returned or on which the operation is to be performed.Returns : The method can return two types of values:
Returns an integer value with a single 1-bit, in the position of the lowest-order one-bit in the specified value
Returns zero if the specified value is equal to zero.
Examples: 
Input: 157
Output: Lowest one bit = 1

Input: 0
Output: Lowest one bit = 0

Explanation:
Consider any integer a = 10
Binary Representation = 0000 1010
Lowest bit(at 1) i.e.0000 0010
so result = 2^1=2
Below programs illustrate the java.lang.Integer.lowestOneBit() method:Program 1: For a positive number. 
java
// Java program to illustrate the// java.lang.Integer.lowestOneBit() methodimport java.lang.*; public class Geeks {     public static void main(String[] args)    {         int a = 157;        System.out.println("Given Number = " + a);         // Returns an int value with at most a single one-bit        System.out.print("Lowest one bit = ");        System.out.println(Integer.lowestOneBit(a));         a = 64;        System.out.println("Given Number = " + a);         System.out.print("Lowest one bit = ");        System.out.println(Integer.lowestOneBit(a));         // Here it will return 0 since the number is itself zero        a = 0;        System.out.println("Given Number = " + a);         System.out.print("Lowest one bit = ");        System.out.println(Integer.lowestOneBit(a));    }}
Given Number = 157
Lowest one bit = 1
Given Number = 64
Lowest one bit = 64
Given Number = 0
Lowest one bit = 0
 
Program 2: For a negative number. 
java
// Java program to illustrate the// java.lang.Integer.lowestOneBit() methodimport java.lang.*; public class Geeks {     public static void main(String[] args)    {         int a = -157;        System.out.println("Given Number = " + a);         // It will return an int value with at most a single one-bit        System.out.print("Lowest one bit = ");        System.out.println(Integer.lowestOneBit(a));        a = -17;        System.out.println("Given Number = " + a);         System.out.print("Lowest one bit = ");        System.out.println(Integer.lowestOneBit(a));    }}
Given Number = -157
Lowest one bit = 1
Given Number = -17
Lowest one bit = 1
 
Program 3: For a decimal value and String. Note:It returns a compile time error message when a decimal value and a string is passed as an argument. 
java
// Java program to illustrate the// java.lang.Integer.lowestOneBit() methodimport java.lang.*; public class Geeks {     public static void main(String[] args)    {         // Decimal value is given        int a = 71.57;        System.out.println("Given Number = " + a);         System.out.print("Lowest one bit = ");        System.out.println(Integer.lowestOneBit(a));         // String is passed        a = "12";        System.out.println("Given Number = " + a);         System.out.print("Lowest one bit = ");        System.out.println(Integer.lowestOneBit(a));    }}
Output: 
prog.java:10: error: incompatible types: possible lossy conversion from double to int
    int a = 71.57;
            ^
prog.java:17: error: incompatible types: String cannot be converted to int
    a = "12";
        ^
2 errors
adnanirshad158
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