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C# C# Basics (Retired) Perfect Final

Ankit Biswas
Ankit Biswas
280 Points
Posted by Ankit Biswas
Ankit Biswas
280 Points

I can't understand the logic of this program please help me to under stand it.

Add input validation to the below program by printing "You must enter a whole number." if the user enters a decimal or something that isn’t a number.

Wrap all of the code contained in the Main method in a try/catch block The catch block should catch FormatException exceptions Inside of the catch block, output to the console the message "You must enter a whole number."

How it get printed many times under the loop and why we use i+=1 ?

Program.cs 
using System;

namespace Treehouse.CodeChallenges
{
    class Program
    {
        static void Main()
        {
            Console.Write("Enter the number of times to print \"Yay!\": ");
            string input = Console.ReadLine();
             int count = int.Parse(input);
             if(count > 0)
        {

            try
            {

            int i = 0;
            while(i < count)
            {
                i += 1;   
                Console.WriteLine("Yay!");
            }
            }
            }
            else
            {
                Console.WriteLine("You must enter a positive number.");

            }
                catch(FormatException exception)
                {
                    Console.WriteLine("You must enter a whole number.");

                }

        }
    }
}

1 Answer

Steven Parker
Steven Parker
231,269 Points
Steven Parker
Steven Parker
231,269 Points

You have some syntax errors. Please see my answer to your previous question where I describe them in detail.

And the code "i += 1" is using the addition assignment operator to increase the value of "i" by 1. This way, "i" always has a count of the number of times the message has been printed. When it gets larger the the "count" that was asked for, the loop stops.