Java Program to Print the Series 1.5 3.0 4.5 6.0 7.5 …N

In the previous article we have discussed about Java Program to Display Sum of Series 1/2 + 1/3 + 1/4 + 1/5 + … + 1/N

In this article we are going to see how to print the series 1.5 3.0 4.5 6.0 7.5 …N by using Java programming language.

Java Program to Print the Series 1.5 3.0 4.5 6.0 7.5 …N

On observing the pattern carefully, we can see

1^st number starts from 1.5, and the next number is 1.5 added to the previous number, Where N is the number of terms.

Example:

1.5
1.5 + 1.5 = 3.0
3.0 + 1.5 = 4.5
4.5 + 1.5 = 6.0
6.0 + 1.5 = 7.5
So the series for N=5 is 1.5  3.0  4.5  6.0  7.5

Let’s see different ways to print the series 1.5 3.0 4.5 6.0 7.5 …N.

By Using For Loop
By Using while Loop
By Using User Defined Method

Method-1: Java Program to Print the Series 1.5 3.0 4.5 6.0 7.5 …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 double variable result and initialize it to 1.5.
Use a for loop from i=1 to i<n incremented by 1
Inside loop we will increment the result with addition of 1.5 to the previous 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();
        double result = 1.5;
        System.out.print(result);
        //for loop to print the series
        for (int i = 1; i < n; i++) 
        {
            result +=1.5; 
            System.out.print(" "+result);
        } 
    }
}

Output:

Enter the Nth term “N” 
5
1.5 3.0 4.5 6.0 7.5

Method-2: Java Program to Print the Series 1.5 3.0 4.5 6.0 7.5 …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 result and initialize it to 1.5.
Declare and initialize an double variable i=1
Continue a while loop till i<n incremented by 1
Inside loop we will increment the result with addition of 1.5 to the previous 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();
        double result=1.5;
        System.out.print(result);
        int i=1;
        while(i<n)
        {
            result +=1.5; 
            System.out.print(" "+result);
            i++;
        }      
    }
}

Output:

Enter the Nth term “N” 
7
1.5 3.0 4.5 6.0 7.5 9.0 10.5

Method-3: Java Program to Print the Series 1.5 3.0 4.5 6.0 7.5 …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.
Let declare an double variable result and initialize it to 1.5.
Use a for loop from i=1 to i<n incremented by 1
Inside loop we will increment the result with addition of 1.5 to the previous 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);
    }
    //user defined method printSeries() to print the series
    public static void printSeries(int n)
    {
        double result = 1.5;
        System.out.print(result);
        //for loop to print the series
        for (int i = 1; i <n; i++) 
        {
            result +=1.5; 
            System.out.print(" "+result);
        } 
    }
}

Output:

Enter the value of Nth term 'N' 
9
1.5 3.0 4.5 6.0 7.5 9.0 10.5 12.0 13.5

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