Java Program to Print Series 3 6 9 12 15 18 …N

In the previous article, we have discussed about Java Program to Print Series 2 4 6 8 10 12 …N

In this article we are going to see how to print the series 3 6 9 12 15 18 …N by using Java programming language.

Java Program to Print Series 3 6 9 12 15 18 …N

In this series it can be seen that

Numbers at each position ‘i‘, the term is calculated as 3×i OR
First element of series is 3 and next elements are calculated as previous element + 3

For example, if the series has 3 terms, the output will be

3×1 3×2 3×3

3 6 9

For example, if the series has 5 terms, the output will be

3×1 3×2 3×3 3×4 3×5

3 6 9 12 15

Let’s see different ways to find the series.

By Using Multiplication
By Using Addition
By Using User Defined Method

Method-1: Java Program to Print Series 3 6 9 12 15 18 …N By Using Multiplication

Approach:

Create Scanner class object.
Declare an integer variable ‘n‘ which holds the value of number of terms in the series.
Prompt the user to enter the value of variable ‘n‘
Run a for loop from i=0 to i<=n.
Inside the loop, print 3*i

Program:

import java.util.Scanner;
public class Main 
{
    public static void main(String[] args)
    {
        //create a Scanner object
        Scanner sc = new Scanner(System.in);
        //prompt the user to enter the number of terms
        System.out.print("Enter the number of terms: ");
        int n = sc.nextInt();
        //print the series
        System.out.print("The series is: ");
        for (int i = 1; i <= n; i++)
        {
            System.out.print(3*i + " ");
        }
    }
}

Output:

Enter the number of terms: 10
The series is: 3 6 9 12 15 18 21 24 27 30

Method-2: Java Program to Print Series 3 6 9 12 15 18 …N By Using Addition

Approach:

Create Scanner class object.
Declare an integer variable ‘n‘ which holds the value of number of terms in the series.
Declare an integer variable say ‘value‘ and initialize it with value 3.
Prompt the user to enter the value of variable ‘n‘
Print ‘value‘ which is having value 3.
Run a for loop from i=0 to i<n-1.
Inside the loop, print value+3 , as by using addition logic when we will add previous element with 3 then we will get next element of the series.

Program:

import java.util.Scanner;
public class Main 
{
    public static void main(String[] args)
    {
        // create a Scanner object
        Scanner sc = new Scanner(System.in);
        // prompt the user to enter the number of terms
        System.out.print("Enter the number of terms: ");
        int n = sc.nextInt();
        int value=3;
        // print the series
        System.out.print("The series is: ");
        System.out.print(value+" ");
        for (int i = 0; i < n-1; i++)
        {
            value=value+3;
            System.out.print(value+" ");
        }
    }
}

Output:

Enter the number of terms: 5
The series is: 3 6 9 12 15

Method-3: Java Program to Print Series 3 6 9 12 15 18 …N By Using User Defined Method

Approach:

Create Scanner class object.
Declare an integer variable ‘n‘ which holds the value of number of terms in the series.
Prompt the user to enter the value of variable ‘n‘
Then call a user defined method by passing n as parameter.
Inside method run a for loop from i=0 to i<=n.
Inside the loop, print 3*i

Program:

import java.util.Scanner;
public class Main
{
    public static void main(String[] args)
    {
        //create a Scanner object
        Scanner sc = new Scanner(System.in);
        //prompt the user to enter the number of terms
        System.out.print("Enter the number of terms: ");
        int n = sc.nextInt();
        //call the method to print the series
        printSeries(n);
    }
    
    //user defined method printSeries() to print series
     private static void printSeries(int n) 
    {
        System.out.println("The series is: ");
        for (int i = 1; i <= n; i++) 
        {
            System.out.print(3*i + " ");
        }
    }
}

Output:

Enter the number of terms: 8
The series is: 
3 6 9 12 15 18 21 24

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