using System;

public class IntDoubleString

{

    public static void Main()

    {

        Console.WriteLine("Please choose a type:" +

                           "\n 1 ---> int" +

                           "\n 2 ---> double" +

                           "\n 3 ---> string");

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

​

        if (n > 0 && n < 4)

        {

            switch (n)

            {

                case 1:

                    Console.WriteLine("Please enter int:");

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

                    a += 1;

                    Console.WriteLine(a);

                    break;

                case 2:

                    Console.WriteLine("Please enter double:");

                    double b = double.Parse(Console.ReadLine());

                    b += 1;

                    Console.WriteLine(b);

                    break;

                case 3:

                    Console.WriteLine("Please enter string:");

                    string c = Console.ReadLine();

                    Console.WriteLine("{0}*");

                    break;

                default:

                    Console.WriteLine("Not a valid enter");

                    break;

            }

        }

        else

        {

            Console.WriteLine("Not a valid line");

        }

​

    }

​

}

​

​