operation C# basic

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

namespace exam_24_04
{
    class Program
    {
        static void Main(string[] args)
        {
            var a = double.Parse(Console.ReadLine());
            var b = double.Parse(Console.ReadLine());
            var operation = Console.ReadLine();

            switch (operation)
            {
                case "+":
                    Console.WriteLine("{0} {1} {2} = {3} - {4}", a, operation, b, a + b, (a + b) % 2 == 0 ? "even" : "odd"); break;
                case "-":
                    Console.WriteLine("{0} {1} {2} = {3} - {4}", a, operation, b, (a - b), (a - b) % 2 == 0 ? "even" : "odd"); break;
                case "*":
                    Console.WriteLine("{0} {1} {2} = {3} - {4}", a, operation, b, a * b, (a * b) % 2 == 0 ? "even" : "odd"); break;
                case "/":
                    if (b == 0)
                    {
                        Console.WriteLine("Cannot divide {0} by zero", a);break;
                    }
                    else
                    {
                        Console.WriteLine("{0} {1} {2} = {3:f2}", a, operation, b, a / b); break;
                    }
                case "%":

                    if (b == 0)
                    {
                        Console.WriteLine("Cannot divide {0} by zero", a); break;
                    }
                    else
                    {
                        Console.WriteLine("{0} {1} {2} = {3}", a, operation, b, a % b); break;
                    }
            }
        }

        }
    }