Programming Example

Using switch statement, write a menu driven program for the following:

To find and display the sum of the series given below:
S = x¹ - x² + x³ - x⁴ + x⁵ .......... - x²⁰
(where x = 2)

To display the following series:
1 11 111 1111 11111

For an incorrect option, an appropriate error message should be displayed.

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💻 Practical Program

📘 Step by Step Learning

Study this program carefully to understand the logic, output, and explanation in a structured way.

Information & Algorithm

Given Input:

Expected Output:

Program Code

import java.util.Scanner;

public class RAnsariSeriesMenu
{
    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        System.out.println("1. Sum of the series");
        System.out.println("2. Display series");
        System.out.print("Enter your choice: ");
        int choice = in.nextInt();

        switch (choice) {
            case 1:
            int sum = 0;
            for (int i = 1; i <= 20; i++) {
                int x = 2;
                int term = (int)Math.pow(x, i);
                if (i % 2 == 0)
                    sum -= term;
                else
                    sum += term;
            }
            System.out.println("Sum=" + sum);
            break;

            case 2:
            int term = 1;
            for (int i = 1; i <= 5; i++) {
                System.out.print(term + " ");
                term = term * 10 + 1;
            }
            break;

            default:
            System.out.println("Incorrect Choice");
            break;
        }
    }
}

Output

1. Sum of the series
2. Display series
Enter your choice: 1
Sum=-699050
Press any key to continue . . .


1. Sum of the series
2. Display series
Enter your choice: 2
1 11 111 1111 11111 Press any key to continue . . .

How to learn from this program

First read the algorithm, then study the program code line by line. After that, compare the code with the output and finally go through the explanation. This approach helps learners understand both the logic and the implementation properly.

Practice suggestion

After understanding this example, try to rewrite the same program without looking at the code. Then change some values or logic and run it again. This helps improve confidence and keeps learners engaged on the page for longer.