C# C# Objects Inheritance Inheritance

By inner class, does the code challenge mean sub-class?

The bummer note tell's me to create an inner class named Square, but isn't that what I'm doing when I type "class Square : Polygon"?

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;
           }
    }
    }
}

1 Answer

Brooks G
Brooks G
5,273 Points

You're right, and you have everything written correctly for your "Square" class definition (tho no need to indent the Square's constructor any farther than its SideLength field).

It's your curly brackets that are preventing you from proceeding -- you have one extra closing bracket for the "Square" class, and you're missing the closing bracket for the "Polygon" class. It should appear as such:

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

        public Polygon(int numSides)
        {
            NumSides = numSides;
        }
    } // added closing bracket here

    class Square : Polygon
    {
        public readonly int SideLength;

        public Square(int sideLength) : base(4)
        {
            SideLength = sideLength;
        }
    }
     //removed the closing bracket here
}

That simple fix will see that you've successfully completed the challenge.

Those little issues are often the easiest to gloss over! Hope this helps.

Thanks! That did the trick.