whileLoopPractice3

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

namespace whileLoopPractice3 {
    class Program {
        static void Main(string[] args) {
            Console.Write("Input number: ");
            int number,res = 0;
            number = int.Parse(Console.ReadLine());
            while(number <= 0) {
                Console.Write("Input number, again: ");
                number = int.Parse(Console.ReadLine());
            }
            Console.Write("Which operator:");
            string opr = Console.ReadLine(), opname = "", opsign = "";
            switch(opr){
                case "1":
                    res = number + number;
                    opname = "Sum";
                    opsign = "+";
                    break;
                case "2":
                    res = number - number;
                    opname = "Minus";
                    opsign = "-";
                    break;
                case "3":
                    res = number * number;
                    opname = "Multiple ";
                    opsign = "x";
                    break;
                case "4":
                    res = number / number;
                    opname = "Divide";
                    opsign = "÷";
                    break;
            }
            Console.WriteLine("{2} of {0} {3} {0} = {1}", number, res, opname, opsign);
            Console.ReadKey();
        }
    }
}