# 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

0+2=2

2+4=6

6+6=12

12+8=20 … so on.

 0 2 6 12 20 30 …… N

+2                   +4                   +6                  +8                   +10

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

### 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;
System.out.print(result);
//for loop to print the series
for (int i = 1; i <= n-1; i++)
{
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;
System.out.print(result);
int i=1;
while(i<=n-1)
{
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;
System.out.print(result);
//for loop to print the series
for (int i = 1; i <= n-1; i++)
{
System.out.print(" "+result);
}
}
}

Output:

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

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