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# Objects Inheritance Inheritance

Inheritance in code

Please help. It gives me this message when I try checking my work: "Bummer: Did you define your Square class as an inner class of the Polygon class? Be sure to define the Square class before or after the definition for the Polygon class."

I don't know what I did wrong.

Polygon.cs
namespace Treehouse.CodeChallenges
{
    class Polygon
    {
        public readonly int NumSides

        public Polygon(int numSides)
        {
            NumSides = numSides;
        }

        class Square : Polygon
        {

        public readonly int SideLength;

        public Square(int sideLength) : base(4)
        {
            SideLength = sideLength;
        }
    }
}

2 Answers

Steven Parker
Steven Parker
229,981 Points

The remedy was given as a hint in the error message "Be sure to define the Square class before or after the definition for the Polygon class." Right now, it's defined inside the other class:

// how it is now:
    class Polygon
    {
        class Square : Polygon  // note that this is INSIDE the Polygon class
        {
        }
    }

// how it SHOULD be:
    class Polygon
    {
    }
    class Square : Polygon  // now it is at the same nesting level as the other class
    {
    }

Thank you very much

Steven Parker
Steven Parker
229,981 Points

Sharon Gracious Thato Khumomotse β€” Glad to help. You can mark a question solved by choosing a "best answer".
And happy coding!

namespace Treehouse.CodeChallenges { class Polygon { public readonly int NumSides;

    public Polygon(int numSides)
    {
        NumSides = numSides;
    }
}

class Square : Polygon 
{
    public readonly int SideLength;

    public Square(int sideLength) : base(4) 
    {
        SideLength = sideLength;           
    }
}

}

give that a try

Thanks a lot