Java Program to print Series 2 4 16 256 … N

Print powers of 2 java – Java Program to Print the Series 2 4 16 256 … N

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Print powers of 2 java: In the previous article we have discussed about Java Program to Print Series 0 3 8 15 24 35 48…N

In this article we are going to see how to print the series 2 4 16 256 … N by using Java programming language.

Java Program to Print the Series 2 4 16 256 … N

On observing the pattern carefully, we can see

1st number starts from 2

Then the next number is the square of the previous number

Example:

2 4 16 256 65536 …… N-1 N

                   2^2              4^2             16^2            256^2         65536^2                           (N-1)^2

Let’s see different ways to print the series 2 4 16 256 … N

Method-1: Java Program to Print the Series 2 4 16 256 … N By Using For Loop

Approach:

  • Create Scanner class object.
  • Declare an integer variable say ‘n’ which holds the Nth term of the series
  • Prompt the user to enter a number as value of n.
  • Let declare a long variable say ‘result’ and initialize it to 2
  • Use a for loop from i=1 to i<=n-1 where the loop is incremented by 1
  • Inside the for loop we will find the value of square of the result and then again we will store that value with the result.
  • Print the result in the series.

Program:

import java.util.*;
public class Main
{
    public static void main(String [] args)
    {
        //creating object of Scanner class 
        Scanner s = new Scanner(System.in);
        //Taking input of number of elements in the series
        System.out.println("Enter the Nth term “N” ");
        int n = s.nextInt();
        long result = 2;
        System.out.print(result);
        //for loop to print the series
        for (int i = 1; i <= n-1; i++) 
        {
            result *=result; 
            System.out.print(" "+result);
        } 
    }
}


Output:

Enter the Nth term “N” 
5
2 4 16 256 65536

Method-2: Java Program to Print the Series 2 4 16 256 … N By Using While Loop

Approach:

  • Create Scanner class object.
  • Declare an integer variable say ‘n’ which holds the Nth term of the series
  • Prompt the user to enter a number as value of n.
  • Let declare a long variable say ‘result’ and initialize it to 2
  • Declare and initialize an integer variable i=1
  • Continue a while loop till i<=n-1, where i is incremented by 1.
  • Inside the while loop we will find the value of square of the result and then again we will store that value with the result.
  • Print the result in the series.

Program:

import java.util.*;
public class Main
{
    public static void main(String [] args)
    {
        //creating object of Scanner class 
        Scanner s = new Scanner(System.in);
        //Taking input of number of elements in the series
        System.out.println("Enter the Nth term “N” ");
        int n = s.nextInt();
        long result=2;
        System.out.print(result);
        int i=1;
        while(i<=n-1)
        {
            result *=result; 
            System.out.print("  "+result);
            i++;
        }      
    }
}

Output:

Enter the Nth term “N” 
6
2 4 16 256 65536 4294967296

Method-3: Java Program to Print the Series 2 4 16 256 … N By Using User Defined Method

Approach:

  • Create Scanner class object.
  • Declare an integer variable say ‘n’ which holds the Nth term of the series
  • Prompt the user to enter a number as value of n.
  • Call a user defined method printSeries() by passing n as parameter.
  • Inside method declare a long variable say ‘result’ and initialize it to 2
  • Use a for loop from i=1 to i<=n-1 where the loop is incremented by 1
  • Inside the for loop we will find the value of square of the result and then again we will store that value with the result.
  • Print the result in the series.

Program:

import java.util.*;
public class Main
{
    public static void main(String[] args)
    {
        // creating object of scanner class 
        Scanner s = new Scanner(System.in);
        //Taking input of number of elements in the series
        System.out.println("Enter the value of Nth term 'N' ");
        int n = s.nextInt();
        // calling printSeries method to print the series
        printSeries(n);
    }
    
    //printSeries metthod to print the series
    public static void printSeries(int n)
    {
        long result = 2;
        System.out.print(result);
        //for loop to print the series
        for (int i = 1; i <=n-1; i++) 
        {
            result *=result; 
            System.out.print(" "+result);
        } 
    }
}

Output:

Enter the value of Nth term 'N' 
6
2 4 16 256 65536 4294967296

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