Java : Program to check if a given integer number is power of two.

/*
 * @author : P programs
 * Check if a given integer number is power of 2 or not.
 * Exp :8 is a power of 2
 *     :10 is not a power of 2
 *     :32 is a power of 2.
 *
 * To find whether a number is power of 2 or not, we can do a AND operation between number and number-1 ,
 * if AND operation results in 0 then it's a valid power of 2 else its not.
*/

import java.util.*;

public class FindIntegerPowOf2 {

 public static void main(String[] args) {
  
  Scanner sc = new Scanner(System.in);
  System.out.print("Enter valid Integer number : - ");
  int validIntNumber = sc.nextInt();
  int result = pow2(validIntNumber);
  
  System.out.println(result);
  
  if (result ==0){
   System.out.println("Number is a valid power of 2 ");
  }else
  {
   System.out.println("Number is not a valid power of 2 ");
  }
  
  
 }
 
 public static int pow2(int number){
  
  number = number & (number-1);
  return number;
  
 }

}