using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

​

namespace CalculatorApp

{

    class Program

    {

        static void Main(string[] args)

        {

            Console.WriteLine("Hello World");

​

            // int sum = 4 + 9;

​

            Console.WriteLine("Enter a number:");

            string firstNumber = Console.ReadLine();

​

            int numberOne = 0;

            try

            {

                numberOne = int.Parse(firstNumber);

            }

            catch

            {

                Console.WriteLine("Could not convert first number to int");

            }

            Console.WriteLine("Enter a second number:");

            string secondNumber = Console.ReadLine();

​

            Console.WriteLine("The first number is " + firstNumber);

            Console.WriteLine($"The second number is {secondNumber}");

​

            int numberOne = int.Parse(firstNumber);

            int numberTwo = int.Parse(secondNumber);

​

            int sum = numberOne + numberTwo;

​

            Console.WriteLine($"The sum is {sum}");

​

            Console.ReadKey();

​

​

        }

    }

}