using System;

using System.Collections.Generic;

using System.Text;

using System.Linq;

​

namespace ConsoleAppDay1

{

    public class Program

    {

        public static void Main(string[] args)

        {

            Console.WriteLine("Enter 1 to add, 2 to subtract, or 3 to multiply");

            string x = Console.ReadLine();

            int result = Convert.ToInt32(x);

            switch (result)

            {

                case 1:

                    int num = AddNumbers();

                    Console.WriteLine(num);

                    break;

                case 2:

                    int num2 = SubtractNumbers();

                    Console.WriteLine(num2);

                    break;

                case 3: 

                    MultiplyNumbers();

                    break;

                default: 

                    break;

            }

        }

        public static int AddNumbers (){

            Console.WriteLine("Please Enter Two Numbers To Add...");

            string y = Console.ReadLine();

            string z = Console.ReadLine();          

            int num = Convert.ToInt32(y) + Convert.ToInt32(z);  

            return num;

        }

        public static int SubtractNumbers() {

            Console.WriteLine("How many numbers do you want to subtract: ");

            string numbers = Console.ReadLine();

            int nums = Convert.ToInt32(numbers);

            int num = 0;

            for (var i = 0; i < nums; i++) { 

                Console.WriteLine("Enter a number to subtract: ");

                string subNum = Console.ReadLine();

                int result = Convert.ToInt32(subNum); 

                num -= result; 

                //num = num - result;

            }

            return num; 

        }

        public static void MultiplyNumbers(){

            Console.WriteLine("How many numbers do you want to multiply?");

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

            int[] numArray = new int[num];

            int startingNum = 1;

            for (var i=0; i < numArray.Count(); i++) {

                Console.WriteLine("Please enter " + i + ":");

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

                startingNum *= numEntered;

                //startingNum = numEntered * startingNum;

                numArray[i] = numEntered;

            }

            Console.WriteLine(startingNum);

        }

    }

}