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C# C# Objects Encapsulation with Properties Expression Bodied Members

Valentina Peric
Valentina Peric
10,651 Points
Posted by Valentina Peric
Valentina Peric
10,651 Points

syntactic sugar help

really not sure what i am doing wrong

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

        public double Area => get return SideLength * SideLength;

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

        public void Scale(double factor) => SideLength *= factor;

    }
}
Polygon.cs 
namespace Treehouse.CodeChallenges
{
    class Polygon
    {
        public int NumSides => get; private set; 

        public Polygon(int numSides) => NumSides = numSides;

    }
}

3 Answers

Edward Ries
Edward Ries
7,388 Points
Edward Ries
Edward Ries
7,388 Points

You have a couple issues. Leave this property as it was with the braces. Replacing two braces with => wouldn't provide any benefit and as you found out doesn't work.

public double SideLength => get; private set; <- don't do this. Keep it with the braces.

This is the constructor and not a normal method. You can tell because it has no return type. Don't try to shorten it. Remove the => and add back the braces.

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

Valentina Peric
Valentina Peric
10,651 Points
Valentina Peric
Valentina Peric
10,651 Points

Ok i made the changes but it still is not compiling correctly?

SQUARE.CS

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

    public double Area => get return SideLength * SideLength;

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

    public void Scale(double factor) => SideLength *= factor;
}

}

POLYGON.CS

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

    public double Area => get return SideLength * SideLength;

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

    public void Scale(double factor) => SideLength *= factor;
}

}

What am i missing now?

Edward Ries
Edward Ries
7,388 Points
Edward Ries
Edward Ries
7,388 Points

public double Area => get return SideLength * SideLength; <- remove get and return as they do not apply to this type of expression.

    public double Area => SideLength * SideLength;