Operation with Method Example

using System;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            string command = Console.ReadLine();
            int firstNum = int.Parse(Console.ReadLine());
            int secondNum = int.Parse(Console.ReadLine());
            switch (command)
            {
                case "add":
                    Add(firstNum, secondNum);
                    break;
                case "subtract":
                    Subtract(firstNum, secondNum);
                    break;
                case "multiply":
                    Multiply(firstNum, secondNum);
                    break;
                case "divide":
                    Divide(firstNum, secondNum);
                    break;
                default:
                    Add(firstNum, secondNum);
                    break;

            }
        }

        static void Add(int num1,int num2)
        {
            Console.WriteLine(num1+num2);
        }

        static void Subtract(int num1,int num2)
        {
            Console.WriteLine(num1-num2);
        }

        static void Multiply(int num1,int num2)
        {
            Console.WriteLine(num1*num2);
        }

        static void Divide(int num1,int num2)
        {
            Console.WriteLine(num1/num2);
        }
    }
}