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

Tianxing Cheng
Tianxing Cheng
1,179 Points

Not sure how to initialize NumSides to 4 using the base. The hint provided does not help at all.

Simply need the correct answer to this challenge, and I should be able to figure out the syntax...

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 Polygon (int numSides)
        {
            numSides = 4;
            SideLength = sideLength;
        }
    }
}

1 Answer

Steven Parker
Steven Parker
231,271 Points

You're over-thinking this one.

What the hint was trying to say is to literally pass the number 4 as the argument to base:

        public Square(int sideLength) : base(4)

Also, there's no numSides (with lower-case "n") property (nor is one needed).

Tianxing Cheng
Tianxing Cheng
1,179 Points

Thank you, Steven. It totally makes sense to me now.