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C# C# Objects Encapsulation with Properties Computed Properties

Posted by Barry Ort
Barry Ort
12,373 Points

what's the correct answer?

I can't figure out what the correct answer is.

Square.cs 
namespace Treehouse.CodeChallenges
{
    class Square : Polygon
    {
        public double SideLength { get; private set; }

        public Square(double sideLength) : base(4)
        {
            SideLength = sideLength;
        }
    }
}
Polygon.cs 
namespace Treehouse.CodeChallenges
{
    public class Polygon
    {
        public int NumSides { get; private set; }

        public Polygon(int numSides)
        {
            NumSides = numSides;
        }
    }
}
Steven Parker
Steven Parker
231,271 Points
Steven Parker
Steven Parker
231,271 Points

It doesn't look like you've written any code yet.

At least please give it a good-faith attempt and then ask for help if you have trouble.

And as a hint: the area of a square is side length multiplied by itself.

Barry Ort
Barry Ort
12,373 Points

I've been working in this for a few days now and I've tried out a bunch of things that didn't work. I followed the error messages that are displayed on preview and this one had the least errors (only 1).

namespace Treehouse.CodeChallenges
{
    class Square : Polygon
    {
        public double SideLength { get; private set; }

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

    }
    public double Area 
    {
        get 
        {
            return SideLength *= SideLength;
        }
    }
}

3 Answers

Patricia Hector
Patricia Hector
42,901 Points
Patricia Hector
Patricia Hector
42,901 Points

Check it from inside to outside -your SideLength property is closed, you have two curly brackets { ...} -your constructor (Square) is closed as well, two curly brackets {...} -your Area property and class Square have two -but your namespace has one open curly bracket but there is not a close curly bracket

You can also use a trick: count how many open curly brackets and close curly brackets you have. If the result is the same, everything is fine if it's not, then check your work again. In this case, just add one to the end of the document.

Barry Ort
Barry Ort
12,373 Points

Fantastic you were right! Thatnk s lot!

Steven Parker
Steven Parker
231,271 Points
Steven Parker
Steven Parker
231,271 Points

You're really close there.
There was originally a closing brace on line 10, but it seems to have gone missing. Be sure to put it back.

But you also don't want to use a multiplication assignment operator ("*=") in your computed property. This permanently changes the value of SideLength. All you need is an ordinary multiplication operator ("*").

The challenge might let you get away with it, but it shouldn't. That's actually a bug in the challenge and you might want to report it to Support.

Patricia Hector
Patricia Hector
42,901 Points
Patricia Hector
Patricia Hector
42,901 Points

Everything is fine Barry, you are just missing a curly bracket after your property.)

Barry Ort
Barry Ort
12,373 Points

besides the one that is under it?