Java Program to Print the Series 7, 10, 8, 11, 9, 12, ... N

In the previous article we have discussed about Java Program to print Series 3 6 11 18 27 … N

In this article we are going to see how to print the series 7, 10, 8, 11, 9, 12, … N by using Java programming language.

Java Program to Print the Series 7, 10, 8, 11, 9, 12, … N

On observing the pattern carefully, we can see

1^st number starts from 7, then the next number is 3 added with the previous number, and then the next number is 2 subtracted with the previous number.

Example:

……

+3 -2 +3 -2 +3

Let’s see different ways to print the series 7, 10, 8, 11, 9, 12, … N

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

Method-1: Java Program to Print the Series 7, 10, 8, 11, 9, 12, … 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 an integer variable say ‘result’ and initialize it to 7 and print it as first term.
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 using if-else condition If i is odd, then we will add 3 with the result Else if i is even, then we will subtract 2 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();
        int result = 7;
        System.out.print(result);
        //for loop to print the series
        for (int i = 1; i <= n-1; i++) 
        {
            if(i%2 != 0)
                result+=3;
            else
                result-=2; 
                System.out.print(" "+result);
        } 
    }
}

Output:

Enter the Nth term “N” 
5
7 10 8 11 9

Method-2: Java Program to Print the Series 7, 10, 8, 11, 9, 12, … 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 an integer variable say ‘result’ and initialize it to 7 and print it as first term.
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 using if-else condition If i is odd, then we will add 3 with the result Else if i is even, then we will subtract 2 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();
        int result=7;
        System.out.print(result);
        int i=1;
        while(i<=n-1)
        {
            if(i%2 != 0)
                result+=3;
            else
                result-=2; 
                System.out.print("  "+result);
                i++;
        }      
    }
}

Output:

Enter the Nth term “N” 
7
7 10 8 11 9 12 10

Method-3: Java Program to Print the Series 7, 10, 8, 11, 9, 12, … 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.
Then call a user defined method say printSeries() by passing n as parameter.
Inside method declare an integer variable say ‘result’ and initialize it to 7 and print it as first term.
Declare and initialize an integer variable i=1
Continue a while loop till i<=n-1, where i is incremented by 1.
Inside the for loop we will find the value of result using if-else condition If i is odd, then we will add 3 with the result Else if i is even, then we will subtract 2 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)
    {
        int result = 7;
        System.out.print(result);
        //for loop to print the series
        for (int i = 1; i <= n-1; i++) 
        {
            if(i%2 != 0)
                result+=3;
            else
                result-=2; 
                System.out.print(" "+result);
        } 
    }
}

Output:

Enter the value of Nth term 'N' 
9
7 10 8 11 9 12 10 13 11

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