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Java program to find the next number that is the power of 2

Given/input a number, we have to find the next number that is the power of 2.
Submitted by Nidhi, on March 11, 2022

Problem statement

In this program, we will read an integer number from the user. Then we will find the next number is the power of 2.

Source Code

The source code to find the next number is the power of 2 is given below. The given program is compiled and executed successfully.

// Java program to find the next number 
// that is the power of 2

import java.util.Scanner;

public class Main {
  public static void main(String[] args) {
    Scanner SC = new Scanner(System.in);

    int num = 0;
    int i = 0;

    System.out.printf("Enter Number: ");
    num = SC.nextInt();

    num--;
    while (i <= 4) {
      num = num | (num >> (int) Math.pow(2, i));
      i++;
    }

    num++;
    System.out.printf("The next number, power of 2 is: %d\n", num);
  }
}

Output

Enter Number: 18
The next number, power of 2 is: 32

Explanation

In the above program, we imported the java.util.Scanner package to read the variable's value from the user. And, created a public class Main. It contains a static method main().

The main() method is an entry point for the program. Here, we read an integer number from the user. Then we checked the input number containing the alternative pattern of bits and printed the result.

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