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

(a) To find and display the sum of the series given below:

S = x1 - x2 + x3 - x4 + x5 - ………… - x20; where x = 2

(b) To display the series:

1, 11, 111, 1111, 11111

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

Java

Java Iterative Stmts

ICSE 2017

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Answer

import java.util.Scanner;

public class KboatSeriesMenu
{
    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 term = (int)Math.pow(2, 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;
        }
    }
}

Variable Description Table

Program Explanation

Output

BlueJ output of Using switch statement, write a menu driven program for the following: (a) To find and display the sum of the series given below: S = x 1 - x 2 + x 3 - x 4 + x 5 - ………… - x 20 ; where x = 2 (b) To display the series: 1, 11, 111, 1111, 11111 For an incorrect option, an appropriate error message should be displayed.BlueJ output of Using switch statement, write a menu driven program for the following: (a) To find and display the sum of the series given below: S = x 1 - x 2 + x 3 - x 4 + x 5 - ………… - x 20 ; where x = 2 (b) To display the series: 1, 11, 111, 1111, 11111 For an incorrect option, an appropriate error message should be displayed.

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