TOPIC: Hmm

using System;

namespace Calculator
{
    class Program
    {
        static void Main(string[] args)
        {
            int num1;
            int num2;
            int num3 = 1;
            string method;

            Console.WriteLine("Enter First Number..");
            num1 = Convert.ToInt32(Console.Read());

            Console.WriteLine("Enter Operation..");
            method = Convert.ToString(Console.Read());

            Console.WriteLine("Enter Second Number..");
            num2 = Convert.ToInt32(Console.Read());

            switch (method)
            {
                case "x":
                    num3 = num1 * num2;
                    break;
                case "/":
                    num3 = num1 / num2;
                    break;
                case "+":
                    num3 = num1 + num2;
                    break;
                case "-":
                    num3 = num1 - num2;
                    break;
            }

            Console.WriteLine("{0} {1} {2} = {3}", num1, method, num2, num3);
            Console.ReadLine();
        }
    }
}

using System;

namespace Calculator
{
    public class Program
    {
        public static void Main(string[] args)
        {
            int num1;
            int num2;
            int sum = 0;
            int method;

            Console.WriteLine("Enter First Number..");
            num1 = Convert.ToInt32(Console.ReadLine());
			
			Console.WriteLine("Enter Second Number..");
            num2 = Convert.ToInt32(Console.ReadLine());

            Console.WriteLine("Enter Operation: 0 = Multiplication, 1 = Division, 2 = Sum, 3 = Subtraction");
            method = Convert.ToInt32(Console.ReadLine());

            switch (method)
            {
                case 0:
                    sum = num1 * num2;
                    break;
                case 1:
                    sum = num1 / num2;
                    break;
                case 2:
                    sum = num1 + num2;
                    break;
                case 3:
                    sum = num1 - num2;
                    break;
            }

            Console.WriteLine("Answer is = {0}" , sum);
            Console.ReadLine();
        }
    }
}