Operations Between Numbers

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

namespace DomashnoOperationBetweenNumbers
{
    class Program
    {
        static void Main(string[] args)
        {
            // get input --> int n1 and n2; char - +, -, *, /, %;
            // test if n2 == 0; if true print -> "Cannot divide {N1} by zero"
            // calculate result
            // decide if the result is even or odd
            // print --> +  - * -> "{N1} {оператор} {N2} = {резултат} – {even/odd}"; / -> "{N1} / {N2} = {резултат}"; % -> "{N1} % {N2} = {остатък}"

            int n1 = int.Parse(Console.ReadLine());
            int n2 = int.Parse(Console.ReadLine());
            string operation = Console.ReadLine();

            if (n2 == 0 && (operation == "/" || operation == "%"))
            {
                Console.WriteLine($"Cannot divide {n1} by zero");
            }
            else
            {
                double result = 0.00;
                string evenOrOdd = "0";

                if (operation == "+")
                {
                    result = n1 + n2;
                    double evenOrOddcalc = result % 2;
                    if (evenOrOddcalc == 0)
                    {
                        evenOrOdd = "even";
                    }
                    else
                    {
                        evenOrOdd = "odd";
                    }
                }
                else if (operation == "-")
                {
                    result = n1 - n2;
                    double evenOrOddcalc = result % 2;
                    if (evenOrOddcalc == 0)
                    {
                        evenOrOdd = "even";
                    }
                    else
                    {
                        evenOrOdd = "odd";
                    }
                }
                else if (operation == "*")
                {
                    result = n1 * n2;
                    double evenOrOddcalc = result % 2;
                    if (evenOrOddcalc == 0)
                    {
                        evenOrOdd = "even";
                    }
                    else
                    {
                        evenOrOdd = "odd";
                    }
                }
                else if (operation == "/")
                {
                    result = 1.00 * n1 / n2;
                }
                else
                {
                    result = n1 % n2;
                }

                if (operation == "+")
                {
                    Console.WriteLine($"{n1} {operation} {n2} = {result} - {evenOrOdd}");
                }
                else if (operation == "-")
                {
                    Console.WriteLine($"{n1} {operation} {n2} = {result} - {evenOrOdd}");
                }
                else if (operation == "*")
                {
                    Console.WriteLine($"{n1} {operation} {n2} = {result} - {evenOrOdd}");
                }
                else if (operation == "/")
                {
                    Console.WriteLine($"{n1} / {n2} = {result:f2}");
                }
                else // operation == "%"
                {
                    Console.WriteLine($"{n1} % {n2} = {result}");
                }
            }
        }
    }
}