Calculater.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace VisualStudioDisplay
{
    class Program
    {
        static void Main(string[] args)
        {
            int one = 0;
            int two = 0;

            while (true)
            {
                printMenu();
                string input = getInput(false);
                switch (input)
                {
                    case "1":
                        print("Enter Number 1: ");
                        one = Convert.ToInt32(getInput());
                        print("Enter Number 2: ");
                        two = Convert.ToInt32(getInput());
                        print("The answer is " + Add(one, two));
                        break;
                    case "2":
                        print("Enter Number 1: ");
                        one = Convert.ToInt32(getInput());
                        print("Enter Number 2: ");
                        two = Convert.ToInt32(getInput());
                        print("The answer is " + Subtract(one, two));
                        break;
                    case "Q":
                    case "q":
                        return;
                }
            }
        }

        static void print(string s)
        {
            Console.WriteLine(s);
        }

        static void printMenu()
        {
            print("1. Add");
            print("2. Substract");
            print("Q. Quit");
        }


        static string getInput(bool line = true)
        {
            if(line)
            {
                return Console.ReadLine();
            }
            else
            {
                string input = Console.ReadKey().KeyChar.ToString();
                Console.WriteLine();
                return input;
            }
        }

        static int Add(int one, int two)
        {
            return one + two;
        }

        static int Subtract(int one, int two)
        {
            return one - two;
        }

    }
}