Operacii chisla fixed

using System;

class Program
{
    static void Main()
    {

        var n1 = int.Parse(Console.ReadLine());
        var n2 = int.Parse(Console.ReadLine());
        string operation = Console.ReadLine().ToLower();
        var result = 0.0;

        string oddEven = "";

        switch (operation)
        {
            case "+":
                {
                    result = n1 + n2;
                    oddEven = (result % 2 == 0) ? " - even" : " - odd";
                    break;
                }
            case "-":
                {
                    result = n1 - n2;
                    oddEven = (result % 2 == 0) ? " - even" : " - odd";
                    break;
                }
            case "*":
                {
                    result = n1 * n2;
                    oddEven = (result % 2 == 0) ? " - even" : " - odd";
                    break;
                }
            case "/":
                {
                    if (n2 == 0)
                    {
                        Console.WriteLine("Cannot divide {0} by zero", n1);
                        return;
                    }
                    else
                    {
                        result = (double)n1 / (double)n2;
                        Console.WriteLine("{0} {1} {2} = {3:F2}", n1, operation, n2, result);
                    }
                    break;
                }
            case "%":
                {
                    if (n2 == 0)
                    {
                        Console.WriteLine("Cannot divide {0} by zero", n1);
                        return;
                    }
                    else
                    {
                        result = n1 % n2;
                        Console.WriteLine("{0} {1} {2} = {3}", n1, operation, n2, result);
                    }
                    break;
                }
            default: break;
        }
        if (operation == "+" || operation == "-" || operation == "*")
        { Console.WriteLine("{0} {1} {2} = {3}{4}", n1, operation, n2, result, oddEven); }
    }

}