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C# C# Basics (Retired) Perfect Final

Posted by Barry Ort
Barry Ort
12,373 Points

What is wrong?

I get an error that task #1 isn't working, but when I go back to task #1 everything works fine. So why is this not working?

Program.cs 
using System;

namespace Treehouse.CodeChallenges
{
    class Program
    {
        static void Main()
        {
                    var counter = 0;
                    var amount = 0;
                while(counter < amount) {
                    Console.Write("Enter the number of times to print \"Yay!\": ");
                    var entry = Console.ReadLine(); 
                    try 
                    { 
                        amount = int.Parse(entry);
                        Console.WriteLine("Yay!");
                        counter++;
                    }
                    catch(FormatException)
                    {
                        Console.WriteLine("You must enter a whole number.");
                        continue;
                    }
            }
        }
    }
}

2 Answers

Samuel Savaria
Samuel Savaria
4,809 Points

"var amount = int.Parse(entry);" needs to be inside the "try". The try and catch method is used to prevent exceptions from crashing your program. If "catch" detects an exception, it will destroy the value and run whatever code you want.

You are using the .Parse method. The problem with it is, if the use enters a string, the program will crash. So, you use the try and catch to prevent it. If any code in "try" gets the exception "FormatException", the program will destroy the string value and run "catch" instead.

Barry Ort
Barry Ort
12,373 Points

Thanks. I don't know why it still wasn't working the other day, but I started the challenge over tonight and it worked.

Samuel Savaria
Samuel Savaria
4,809 Points
Samuel Savaria
Samuel Savaria
4,809 Points

I'm not sure what you mean by task, but you should the prompt the user to enter the number of times to print "Yay", before the loop. As it is now, you are asking the user how many times to print "Yay", print it once, and ask again.

Also, you could optimise your code by keeping the .Parse method out of the loop. You only need to ask for the number of times and convert it to an integer once.

Barry Ort
Barry Ort
12,373 Points

hmmm... I changed the code and it still isn't working

using System;

namespace Treehouse.CodeChallenges
{
    class Program
    {
        static void Main()
        {
                    Console.Write("Enter the number of times to print \"Yay!\": ");
                    var entry = Console.ReadLine(); 
                    var amount = int.Parse(entry);
                    var counter = 0;
                while(counter < amount) {
                    try 
                    { 
                        Console.WriteLine("Yay!");
                        counter++;
                    }
                    catch(FormatException)
                    {
                        Console.WriteLine("You must enter a whole number.");
                        continue;
                    }
                }
        }
    }
}
Samuel Savaria
Samuel Savaria
4,809 Points

"var amount = int.Parse(entry);" needs to be inside the "try". The try and catch method is used to prevent exceptions from crashing your program. If "catch" detects an exception, it will destroy the value and run whatever code you want.

You are using the .Parse method. The problem with it is, if the use enters a string, the program will crash. So, you use the try and catch to prevent it. If any code in "try" gets the exception "FormatException", the program will destroy the string value and run "catch" instead.

I hope you get that answer, I'm not sure how the comments work