Use of Constructor in Abstract Class in C#

Here, I am trying to explain the use of the constructor in the abstract class.

I am Considering Shape as the abstract class and Square and rectangle as the derived class.

public abstract class Shape

{

    protected double x = 10;

    protected double y = 10;

    protected Shape()

    {  }

    protected Shape(double x, double y)

    {

        this.x = x;

        this.y = y;

    }

    public abstract double AreaClaculate();

 }

 public  class square : Shape

 {

    public square()

    { }

    public override double AreaClaculate()

    {

        return x * y;    // here x=10 and y=10 works, i set x=y due to square, if any we have any other shape other than square then x!=y

    }

}

public  class rectangle : Shape

{

    public rectangle(double x, double y)

        : base(x, y)    // it will call Shape(double x, double y) at base class

    {

    }

    public override double AreaClaculate()

    {

         return x * y;   /// hre x and y will pass from runtime

     }

}

static void Main(string[] args)

{

   square s = new square();

   double areasq=  s.AreaClaculate();  // we will get 100, because x=y=100 and x*y=100

   rectangle r = new rectangle(10,5);   // behind the scene 10,5 are passing to shape(double x, double y) at base class

   double arearect = r.AreaClaculate();   // we will get 50.

}

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