using System;

public class Program

{

    public static void Main()

    {

        while (true)

            {

                Console.Clear();

            //Task name

            Console.WriteLine("Task 4 - Menu System\n");

​

            int[] options = new int[3];

​

            Console.WriteLine("\n\n********List of Options*********");

            Console.WriteLine("1. User's Name, Age, Gender and Address");

            Console.WriteLine("2. Two Numbers Calculation");

            Console.WriteLine("3. User's First and Second Name");

​

            Console.Write("\n\nPlease, according to the list of options above, choose the task you want to run (1, 2, 3): ");

            int choice = int.Parse(Console.ReadLine());

​

            switch (choice)

            {

                case 1:

                    //TASK 1 

                    Console.WriteLine("\nYou chose the Task 1 - User's Name, Age, Gender and Address\n");

​

                    //Application will ask for the users name:

                    Console.WriteLine("Hello. What's your name?");

                    string name = Console.ReadLine();

​

                    //Then display the string "Hello (name) and ask for the users age, gender and address and store them in appropriate variables:

                    Console.WriteLine("\nHello {0}. How old are you? (enter only numbers, please)", name);

                    int age = int.Parse(Console.ReadLine());

​

                    Console.WriteLine("\nPlease, what's yor gender (male or female)?");

                    string gender = Console.ReadLine();

​

                    Console.WriteLine("\nCould you please type you address?");

                    string address = Console.ReadLine();

​

                    //Display all of the users input information to the console.

                    Console.WriteLine("\nPlease, check if your personal data is correct");

                    Console.WriteLine("{0}, {1} years old, {2}, and your address is {3}", name, age, gender, address);

                    break;

                case 2:

                    //TASK 2

                    Console.WriteLine("\nYou chose the Task 2 - 2 Numbers Calculation\n");

​

                    float n1;

                    float n2;

                    //Ask the user for 2 numbers:

                    Console.Write("\nPlease, type a number (n1): ");

                    n1 = float.Parse(Console.ReadLine());

​

                    Console.Write("\nType another number (n2): ");

                    n2 = float.Parse(Console.ReadLine());

​

                    // Display the total of the 2 numbers added together:

                    Console.WriteLine("\n\nThe results of the two numbers that you entered are:");

                    Console.WriteLine("\nAddition: n1 + n2 = " + (n1 + n2));

​

                    //Extend the application to perform a multiplication, division and subtraction of the 2 numbers and display the equations and results to the display:

                    Console.WriteLine("Multiplication: n1 * n2 =  " + n1 * n2);

                    Console.WriteLine("Division: n1 / n2 =  " + n1 / n2);

                    Console.WriteLine("Subtraction: n1 - n2 = " + (n1 - n2));

​

                        //Extend your menu to allow the user to select whether they want to perform a multiplication, division, addition or subtraction.

​

                        Console.Write("\n\nPlease, choose the operation you wanto to perfome - multiplication (M), division (D), addition (A) or subtraction (S): ");

                        string operation = Console.ReadLine();

                        if (operation == "M")

                        {

                            Console.WriteLine("Multiplication: n1 * n2 =  " + n1 * n2);

                        } else if (operation == "D")

                        {

                            Console.WriteLine("Division: n1 / n2 =  " + n1 / n2);

                        } else if (operation == "A")

                        {

                            Console.WriteLine("\nAddition: n1 + n2 = {0} + {1}", n1, n2);

                        }

                        else if (operation == "S")

                        {

                            Console.WriteLine("Subtraction: n1 - n2 = " + (n1 - n2));

                        }

                    break;

                case 3:

                    //TASK 3

                    Console.WriteLine("\nYou chose the Task 3 - User's First and Second Name\n");

​

                    string Fname;

                    string Secn;

​

                    //Ask the user for their first name and save that to a variable:

                    Console.WriteLine("Hi. Please, type your first name");

                    Fname = Console.ReadLine();

​

                    //Ask them for their second name and save that to a variable.

                    Console.WriteLine("Type your second name");

                    Secn = Console.ReadLine();

​

                    //Extend the application to display the users first name and last name joined together:

                    Console.WriteLine("Your full name is {0} {1}", Fname, Secn);

                    break;

                    default:

                        Console.WriteLine("\n***This is an unknown task number. Please, enter only 1, 2 or 3.");

                    break;

                }

​

            Console.ReadLine();

            }

    }

}