Java Program to Print the Series 0 2 6 12 20 30 42 … N

In the previous article we have discussed about Java Program to Print the Series 2 4 7 12 21 38 71 … N

In this article we are going to see how to print the series 0 2 6 12 20 30 42 … N by using Java programming language.

Java Program to Print the Series 0 2 6 12 20 30 42 … N

On observing the pattern carefully, we can see

First number starts from 0, then the next term follows below logic

Example:

0+2=2

2+4=6

6+6=12

12+8=20 … so on.

……

+2 +4 +6 +8 +10

Let’s see different ways to print the series 0 2 6 12 20 30 42 … N

By Using For Loop
By Using While Loop
By Using User Defined Method

Method-1: Java Program to Print the Series 0 2 6 12 20 30 42 … N By Using For Loop

Approach:

Create Scanner class object.
Declare an integer variable say ‘n’ which holds the number of elements in the series.
Prompt the user to enter a number as value of n.
Let declare an integer variable say ‘result’ and initialize it to 0
Let declare another integer variable say ‘add’ 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 result=result+add and add=add+2.
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 number of elements ");
        int n = s.nextInt();
        int result = 0;
        int add=2;
        System.out.print(result); 
        //for loop to print the series
        for (int i = 1; i <= n-1; i++) 
        {
            result +=add;
            add+=2;
            System.out.print(" "+result); 
        }
    }
}

Output:

Enter the number of elements
5
0 2 6 12 20

Method-2: Java Program to Print the Series 0 2 6 12 20 30 42 … N By Using While Loop

Approach:

Create Scanner class object.
Declare an integer variable say ‘n’ which holds the number of elements in the series.
Prompt the user to enter a number as value of n.
Let declare an integer variable say ‘result’ and initialize it to 0
Let declare another integer variable say ‘add’ 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 result=result+add and add=add+2.
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();
        int result=0;
        int add = 2;
        System.out.print(result);
        int i=1;
        while(i<=n-1)
        {
            result +=add; 
            add+=2;
            System.out.print(" "+result);
            i++;
        }      
    }
}

Output:

Enter the number of elements
7
0 2 6 12 20 30 42

Method-3: Java Program to Print the Series 0 2 6 12 20 30 42 … N By Using User Defined Method

Approach:

Create Scanner class object.
Declare an integer variable say ‘n’ which holds the number of elements in the series.
Prompt the user to enter a number as value of n.
Then call a user defined method printSeries() by passing n as parameter.
Inside method declare an integer variable say ‘result’ and initialize it to 0
Let declare another integer variable say ‘add’ 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 result=result+add and add=add+2.
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)
    {
        int result = 0;
        int add=2;
        System.out.print(result); 
        //for loop to print the series
        for (int i = 1; i <= n-1; i++) 
        {
            result +=add;
            add+=2;
            System.out.print(" "+result); 
        }
    }
}

Output:

Enter the number of elements
9
0 2 6 12 20 30 42 56 72

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