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

namespace CSharpSumOf2Numbers
{
    class Program
    {
        static void Main(string[] args)
        {
            //try...catch: is used to catch any unexpected behavior during execution time.
            // WHEN an exception is thrown inside the "try" block, the code inside the "catch" block
            // is executed instead of halting the program 

            // In our case here, when the user enters a non-integer operand a format exception
            // will be thrown and catched
            try
            {
                //Declaring variables
                int valueOne;
                int valueTwo;
                int sum;

                //Prompt the user to enter the first operand
                System.Console.WriteLine("Please Enter a Whole Number: ");

                //Fetch the number entered by the user, convert it to an integer and set it to the variable "valueOne"
                valueOne = int.Parse(Console.ReadLine());

                //Prompt the user to enter the second operand
                System.Console.WriteLine("Please Enter a Whole Number: ");

                //Fetch the number entered by the user, convert it to an integer and set it to the variable "valueTwo"
                valueTwo = int.Parse(Console.ReadLine());

                //Calculate the sum of the 2 operands and set it to the variable "sum"
                sum = valueOne + valueTwo;

                //Check if the sum is greater than 0 then print the operands and the sum
                if (sum > 0)
                {
                    Console.WriteLine("The sum of valueOne: {0} and valueTwo: {1} is Equal to: {2}", valueOne, valueTwo, sum);
                }
                else //Else if the sum is NOT greater than 0, 
                {
                    Console.WriteLine("Both values were Zero!");
                }
            }//End of try block
            catch(System.FormatException)
            {
                //The user has entered a non-integer number.
                //Alert the user that he didn't enter a whole number
                Console.WriteLine("You didn't enter a whole number!");
            }//End of catch

            //Exit The program when user clicks on any key
            Console.WriteLine("Please press any key to Exit");
            Console.Read();
        }//End of main method
    }
}