Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

C# C# Basics (Retired) Perfect Final

use of if/else in input validation

Add more input validation to the program by printing "You must enter a positive number." if the user enters a negative number.

Add an if/else conditional statement just after parsing the user's provided input to an integer Write a conditional expression to ensure that the remainder of the code in the try block is only executed if the user provides a non-negative number If the user enters a negative number, output to the console the message "You must enter a positive number."

Program.cs
using System;

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

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


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

1 Answer

Steven Parker
Steven Parker
229,005 Points

It looks like you have a couple of misplaced braces. Right now, the "catch" block is inside the "else" which is inside the "try".

The "catch" should come after the ending brace of the "try" block.