Computer Applications

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

Java

Java Iterative Stmts

ICSE 2011

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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("Type 1 to print series");
        System.out.println("0, 3, 8, 15, 24,....to n terms");
        System.out.println();
        System.out.println("Type 2 to find sum of series");
        System.out.println("(1/2) + (3/4) + (5/6) + (7/8) +....+ (19/20)");
        System.out.println();
        System.out.print("Enter your choice: ");
        int choice = in.nextInt();

        switch (choice) {
            case 1:
                System.out.print("Enter n: ");
                int n = in.nextInt();
                for (int i = 1; i <= n; i++)
                    System.out.print(((i * i) - 1) + " ");
                System.out.println();
                break;
                
            case 2:
                double sum = 0;
                for (int i = 1; i <= 19; i = i + 2)
                    sum += i / (double)(i + 1);
                System.out.println("Sum = " + sum);
                break;
                
            default:
                System.out.println("Incorrect Choice");
                break;
        }
    }
}