# Java Program to Print the Series 7 14 28 56 112 224…N

In the previous article we have discussed about Java Program to Print Series 6 12 24 48 96 192…N

In this article we are going to see how to print the series 7 14 28 56 112 224…N using Java programming language

## Java Program to Print the Series 7 14 28 56 112 224…N

On observing the pattern carefully, we can see the series starts from 7 and the next element is the 2 times of previous element.

Example:

Suppose value of N=5
Then the series =
7 14 28 56 112

Let’s see different ways to print the series 7 14 28 56 112 224…N

### Method-1: Java Program to Print the Series 7 14 28 56 112 224…N By Using For Loop

Approach:

• Declare an integer variable say ‘n’ which holds the number of elements in the series.
• Create Scanner class object.
• Prompt the user to enter a number as value of n.
• Let declare an integer variable ‘result‘ and initialize it to 7.
• Use a for loop from i=1 to i<n incremented by 1.
• Inside for loop we will increment the result with 2 times of the previous 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 number of terms ");
int n = s.nextInt();
int result = 7;
System.out.print(result);
//for loop to print the series
for (int i = 1; i <n; i++)
{
result *=2;
System.out.print(" "+result);
}
}
}

Output:

Enter the value of number of terms
5
7 14 28 56 112

### Method-2: Java Program to Print the Series 7 14 28 56 112 224…N By Using While Loop

Approach:

• Declare an integer variable say ‘n’ which holds the number of elements in the series.
• Create Scanner class object.
• Prompt the user to enter a number as value of n.
• Let declare an integer variable ‘result‘ and initialize it to 7.
• Declare and initialize an integer variable i=1
• Continue a while loop till i<n incremented by 1.
• Inside for loop we will increment the result with 2 times of the previous result
• Print the result in the series.

Program:

import java.util.*;
public class Main
{
public static void main(String [] args)
{
Scanner s = new Scanner(System.in);
//Taking input of number of elements in the series
System.out.println("Enter the value of number of terms ");
int n = s.nextInt();
int result=7;
System.out.print(result);
int i=1;
while(i<n)
{
result *=2;
System.out.print(" "+result);
i++;
}
}
}

Output:
Enter the value of number of terms
7
7 14 28 56 112 224 448

### Method-3: Java Program to Print the Series 7 14 28 56 112 224…N By Using User Defined Method

Approach:

• Declare an integer variable say ‘n’ which holds the number of elements in the series.
• Create Scanner class object.
• Prompt the user to enter a number as value of n.
• Call a user defined method say printSeries() by passing ‘n‘ as parameter.
• Let declare an integer variable ‘result‘ and initialize it to 7.
• Use a for loop from i=1 to i<n incremented by 1.
• Inside for loop we will increment the result with 2 times of the previous 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 number of terms ");
int n = s.nextInt();
// calling printSeries method to print the series
printSeries(n);
}
public static void printSeries(int n)
{
int result = 7;
System.out.print(result);
//for loop to print the series
for (int i = 1; i < n; i++)
{
result *=2;
System.out.print(" "+result);
}
}
}

Output:

Enter the value of number of terms
9
7 14 28 56 112 224 448 896 1792

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