using System;

public class Program

{

    public static void Main()

    {

        //exercise 1

            Console.Write("Please enter a number:");

            int num1 = int.Parse(Console.ReadLine());

            Console.WriteLine("Please Enter a secound number:");

            int num2 = int.Parse(Console.ReadLine());

            Console.WriteLine("Please Enter a matmtic atribut for example: +");

            String opr = (Console.ReadLine());

            if (opr == "+")

            {

                Console.WriteLine("The result is:" + (num1 + num2));

            }

            else if (opr == "-")

            {

                Console.WriteLine("The result is:" + (num1 - num2));

            }

            else if (opr == "*")

            {

                Console.WriteLine("The result is:" + (num1 * num2));

            }

​

            else if (opr == "/")

            {

                Console.WriteLine("The result is:" + (num1 / num2));

            }

            else

            {

                Console.WriteLine("You have not performed a valid action");

            }

            Console.ReadLine();

           //exercise 2

            Console.WriteLine("please enter a number of seconds: ");

            int Seconds = int.Parse(Console.ReadLine());

            int Dyas = Seconds / (86400);

            Seconds = Seconds  % (86400);

            int Hours = Seconds / (3600);

            Seconds = Seconds % (3600);

            int Minutes = Seconds / (60);

            Seconds = Seconds % (60);

            Console.WriteLine(Dyas + ":" + Hours + ":" + Minutes + ":" + Seconds);

            //exercise 3

                        Console.WriteLine("please enter a number:");

            int sum = int.Parse(Console.ReadLine());

            if (sum > 0 || sum == 0)

            {

                Console.WriteLine("your number is positive");

            }

            else

            {

                Console.WriteLine("your number is negative");

            }

            if (sum % 2 == 0)

            {

                Console.WriteLine("your number is even");

            }

            else

            {

                Console.WriteLine("your number is odd");

            }

            if (sum > 100)

            {

                Console.WriteLine("your number is larger then 100");

            }

            else

            {

                Console.WriteLine(" ");

            }

​

    }

}