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Menu Driven - Series Program - Java Programs

Write a menu-driven program to perform the following (use switch case statement):
(a) To print the series 0, 3 7, 15, 24, … n terms (value of ‘n’ is to be an input by the user)
(b) To find the sum of the series given below:
S = 1 / 2 + 3 / 4 + 5 / 6 + 7 / 8 + … + 19 / 20.

Java 

import java.util.Scanner;
class Menu{
    public static void main(String args[]){
        Scanner in = new Scanner(System.in);
        System.out.println("1. Series 1");
        System.out.println("2. Series 2");
        System.out.print("Enter your choice: ");
        int choice = Integer.parseInt(in.nextLine());
        switch(choice){
        case 1:
            System.out.print("n = ");
            int n = Integer.parseInt(in.nextLine());
            for(int i = 1; i <= n; i++)
                System.out.print((i * i - 1) + " ");
            System.out.println();
            break;
        case 2:
            double sum = 0.0;
            for(int i = 1; i <= 19; i++)
                sum += i / (i + 1.0);
            System.out.println("Sum = " + sum);
            break;
        default:
            System.out.println("Invalid choice!");
        }
    }
}

Output

 
 OUTPUT 1: 
1. Series 1
2. Series 2
Enter your choice: 1
n = 10
0 3 8 15 24 35 48 63 80 99 

 OUTPUT 2: 
1. Series 1
2. Series 2
Enter your choice: 2
Sum = 16.40226034285632
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