Java Program to Print the Series 1 9 25 49 81 121 …N

In the previous article we have discussed about Java Program to Display the Series 1.5 3.0 4.5 6.0 7.5 …N

In this article we are going to see how to print the series 1 9 25 49 81 121 …N by using Java programming language

Java Program to Print the Series 1 9 25 49 81 121 …N

On observing the pattern carefully, we can see 1^st number starts from 1 and the next number is i*i where i starts with 1 and increments with i+2, Where N is the number of terms in the series.

Example:

Suppose the value of N=5
i=1, 1*1 = 1
i=3, 3*3 = 9
i=5, 5*5 = 25
i=7, 7*7 = 49
i=9, 9*9 = 81
Then the series is 1 9 25 49 81

Let’s see different ways to print the series 1 9 25 49 81 121 …N.

By Using Static Input Value
By Using User Input Value
By Using User Defined Method

Method-1: Java Program to Print the Series 1 9 25 49 81 121 …N By Using For Loop

Approach:

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

Output:

Enter the Nth term “N” 
5
1 9 25 49 81

Method-2: Java Program to Print the Series 1 9 25 49 81 121 …N By Using While Loop

Approach:

Create Scanner class object.
Declare an integer variable say ‘n’ which holds the value of number of terms in the series.
Prompt the user to enter a number as value of n.
Let declare an integer variable result
Declare and initialize an integer variable i=1
Continue a while loop till i<=2n-1 and i incremented by i+2
Inside loop we will find the value of result= i*i
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;
        int i=1;
        while(i<=2*n-1)
       {
            result =i*i; 
            System.out.print(result+" ");
            i+=2;
       }      
    }
}

Output:

Enter the Nth term “N” 
6
1 9 25 49 81 121

Method-3: Java Program to Print the Series 1 9 25 49 81 121 …N By Using User Defined Method

Approach:

Create Scanner class object.
Declare an integer variable say ‘n’ which holds the value of number of terms 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 result
Use a for loop from i=1 to i<=2n-1 and i incremented by i+2
Inside loop we will find the value of result= i*i
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);
    }
    //user defined method printSeries() to print the series
    public static void printSeries(int n)
    {
        int result;
        //for loop to print the series
        for (int i = 1; i <=2*n-1; i+=2) 
        {
            result =i*i; 
            System.out.print(result+" ");
        } 
    }
}

Output:

Enter the value of Nth term 'N' 
6
1 9 25 49 81 121

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