03. Calculations

using System;

namespace P03_Calculations
{
    class Program
    {
        static void Main(string[] args)
        {
            string command = Console.ReadLine();
            int numOne = int.Parse(Console.ReadLine());
            int numTwo = int.Parse(Console.ReadLine());

            switch(command)
            {
                case "add":
                    Console.WriteLine(Add(numOne, numTwo));
                    break;
                case "multiply":
                    Console.WriteLine(Multiply(numOne, numTwo));
                    break;
                case "subtract":
                    Console.WriteLine(Subtract(numOne, numTwo));
                    break;
                case "divide":
                    Console.WriteLine(Divide(numOne, numTwo));
                    break;
                default: break;
            }
            Add(numOne, numTwo);
            Multiply(numOne, numTwo);
            Subtract(numOne, numTwo);
            Divide(numOne, numTwo);
        }

        private static int Divide(int numOne, int numTwo)
        {
            return numOne / numTwo;
        }

        private static int Subtract(int numOne, int numTwo)
        {
            return numOne - numTwo;
        }

        private static int Multiply(int numOne, int numTwo)
        {
            return numOne * numTwo;
        }

        private static int Add(int numOne, int numTwo)
        {
            return numOne + numTwo;
        }
    }
}