using System;

​

namespace Program

{

    public class Program

    {

        public static void Main()

        {

            while (true)

            {

                try

                {

                    Console.WriteLine(" Calculator");

                    Console.WriteLine("Pyramid");

                    string Palit = Console.ReadLine();

                    switch (Palit)

                    {

                        case "1":

                        {

Console.Write("Enter num1: ");

double num1 = Convert.ToDouble(Console.ReadLine());

​

Console.Write("Enter operator: ");

string op = Console.ReadLine();

​

Console.Write("Enter num2: ");

double num2 = Convert.ToDouble(Console.ReadLine());

​

if (op == "+"){

     Console.WriteLine(num1 + num2);

} else if (op == "-"){

     Console.WriteLine(num1 - num2);

} else if (op == "/"){

     Console.WriteLine(num1 / num2);

} else if (op == "*"){

     Console.WriteLine(num1 * num2);

} else {

     Console.WriteLine("Invalid Operator");

}

Console.WriteLine("Do you want to use this program again? Input Yes.");

                            Console.WriteLine("If you dont want to use this program again. Input No.");

                            string input = Console.ReadLine();

                            if (input == "Yes")

                            {

                                continue;

                            }

​

                            if (input == "No")

                            {

                                break;

                            }

​

                            break;

                            }

​

​

                        case "2":

                        {

                        Console.WriteLine("Enter the Input Number");  

            int count = Convert.ToInt32(Console.ReadLine());  

            for (int i = 0; i <= count; i++) {  

                for (int j = 0; j <= i; j++) {  

                    Console.Write("*");  

                }  

                Console.Write("\n");  

            }  

                            Console.WriteLine("Do you want to try it  again? Input Yes.");

                            Console.WriteLine("If you dont want to try this program again. Input No.");

                            string input = Console.ReadLine();

                            if (input == "Yes")

                            {

                                continue;

                            }

​

                            if (input == "No")

                            {

                                break;

                            }

                        }

​

                            break;

                    }

                    break;

                }

                catch (FormatException)

                {

                    Console.WriteLine("Do not PUT any invalid inputs");

                    break;

                }

            }

        }

    }

}