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Menu Driven Program - Series Program - Java Programs

 

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

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


S = x1 – x2 + x3 – x4 + x5 … – x20
(where x = 2)

(ii) To display the following series:


1 11 111 1111 11111

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

Java 

import java.util.Scanner;
class Menu{
    public static void main(String[] args){
        Scanner in = new Scanner(System.in);
        System.out.println("1. S = x^1 - x^2 + x^3 ... - x^20");
        System.out.println("2. 1 11 111 1111 11111");
        System.out.print("Enter your choice: ");
        int choice = Integer.parseInt(in.nextLine());
        switch(choice){
        case 1:
            int x = 2;
            double sum = 0.0;
            for(int i = 1; i <= 20; i++){
                if(i % 2 == 1)
                    sum += Math.pow(x, i);
                else
                    sum -= Math.pow(x, i);
            }
            System.out.println("Sum = " + sum);
            break;
        case 2:
            int n = 0;
            for(int i = 1; i <= 5; i++){
                n = n * 10 + 1;
                System.out.print(n + " ");
            }
            System.out.println();
            break;
        default:
            System.out.println("Invalid choice!");
        }
    }
}

Output

 
 OUTPUT 1: 
1. S = x^1 - x^2 + x^3 ... - x^20
2. 1 11 111 1111 11111
Enter your choice: 1
Sum = -699050.0 

 OUTPUT 2: 
1. S = x^1 - x^2 + x^3 ... - x^20
2. 1 11 111 1111 11111
Enter your choice: 2
1 11 111 1111 11111
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