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C# C# Objects Encapsulation with Properties Computed Properties

Pedro Gonzalez
Pedro Gonzalez
2,097 Points

Stuck in "Computed Properties" task

I have been stuck with this problem for a couple days. Any help is appreciated.

The problem is I don't know what I am doing wrong and it keeps throwing a error saying "Did you make Square.Area readonly with no setter".

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

        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;
        }
    }
}

1 Answer

Justin Horner
STAFF
Justin Horner
Treehouse Guest Teacher

Hello Pedro,

Since we only need to return a value from the computed property, you only need the "get" part of the property. This will make the property readonly because we don't provide a setter.

In the get block, you'll want to return SideLength * SideLength like this.

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

I hope this helps.