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

1. To find and display the sum of the series given below:
   S = x¹ - x² + x³ - x⁴ + x⁵ .......... - x²⁰
   (where x = 2)
2. To display the following series:
   1 11 111 1111 11111

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

Java Programming Language (Article) (Program)

48

---

Given Input:

Expected Output:

Program:

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 . . .

---

---