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C# C# Objects Encapsulation with Properties Expression Bodied Members

can't solve challenge 2 of 2

Challenge Task 2 of 2

Use the syntactic sugar just learned about to convert the Scale method to a single line method. Important: In each task of this code challenge, the code you write should be added to the code from the previous task. Restart Preview Get Help Check Work Square.cs Polygon.cs

1 namespace Treehouse.CodeChallenges 2 { 3 class Square : Polygon 4 { 5 public double SideLength { get; private set; } 6 ā€‹ 7 public double Area => SideLength * SideLength; 8

9 public Square(double sideLength) : base(4) 10 { 11 SideLength = sideLength; 12 } 13

14 public void Scale(double factor) 15 { 16 SideLength *= factor; 17 } 18 } 19 } 20 ā€‹

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

       public double Area => 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

Steven Parker
Steven Parker
228,119 Points

:point_right: just do what you did in step 1 again.

It's basically just replacing the first brace with "=>" and removing the second brace.

There's a good example of this at about time index 01:58 of the Expression Bodied Members video.

Calvin Secrest
Calvin Secrest
24,815 Points

I tried this step and I got this error

"Did you convert the method to a single-lined, expression bodied method?"

Is there a new Move method we need to change for the task, thanks!

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

    public double Area => SideLength * SideLength;


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

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

}

thanks steven