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

Posted by Mason Austin
Mason Austin
3,365 Points

Have I missed something?

According to the question I have done what it has asked right? I have initialised the variable NumSides and set it to 4, I have initialised the Square class with inheritance from the Polygon class. The SideLength variable was created in the Square class and is public and readonly. I don't know what I have done wrong here

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

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

    }
    class Square : Polygon
    {
        public readonly SideLength;

        public Square(NumSides) : base(NumSides)
        {
            NumSides = 4;
            SideLength = sidelength;
        }
    }
}

1 Answer

Steven Parker
Steven Parker
231,275 Points
Steven Parker
Steven Parker
231,275 Points

There's a few issues:

  • you need to declare the type (int) of "SideLength"
  • the contructor's parameter name should be "sideLength" instead of "NumSides"
  • the parameter also needs to have a type (int)
  • "Numsides" will not be set directly, but by passing 4 to base ("base(4)")
  • the assignment has "sidelength" (lower case) instead of "sideLength" (with capital "L")