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 Variable Scope

Posted by terence lara
terence lara
693 Points

C#

Im not sure what to do with the output. i would replace string output with console.writeline with the string depending on if the input was == to quit or not

Program.cs 
using System;

namespace Treehouse.CodeChallenges
{
    class Program
    {
        static void Main()
        {            
            input = Console.ReadLine();

            if (input == "quit")
            {
                string output = ("Goodbye.");
            }
            else
            {
                string output = ("You entered " + input + ".");
            }

            Console.WriteLine(output);
        }
    }
}
Tomek Mierzejewski
Tomek Mierzejewski
13,776 Points
Tomek Mierzejewski
Tomek Mierzejewski
13,776 Points

In your code variable outpute doesn't exists outside if statment, so when You call it in Console.Writeline(output) You're calling variable which doesn't exists

1 Answer

Steven Parker
Steven Parker
231,210 Points
Steven Parker
Steven Parker
231,210 Points

There are several things to fix in this code. Some things to keep in mind:

  • a variable should be declared before (or when) it is assigned
  • variables should be declared in the outermost scope in which they are used
  • variables should only be declared (or initialized) one time
  • variables can be assigned any number of times