抽象类联系1

usingSystem;

usingSystem.Collections.Generic;

usingSystem.Linq;

usingSystem.Text;

usingSystem.Threading.Tasks;

namespace抽象类练习

{

   classProgram

    {

       staticvoidMain(string[] args)

        {

           //Circle cirle = new Circle(3.0);

           //Square square = new Square(3.0, 7.8);

           //cirle.GetArea();

           //cirle.GetPerimeter();、

           Shapes =newCircle(3.0);

            s.GetArea();

            s.GetPerimeter();

        }

    }

   publicabstractclassShape

    {

       //public Shape(double a)

       //{

       //}

       //public Shape(double a, double b)

       //{

       //}

       //public Shape()

       //{

       //}

       publicabstractvoidGetArea();

       publicabstractvoidGetPerimeter();

    }

   publicclassCircle:Shape

    {

       publicdoublea;

       publicCircle(doublea)

        {

           this.a = a;

        }

       publicoverridevoidGetArea()

        {

           doublearea = a * a * 3.14;

           Console.WriteLine("圆的面积是："+area);

        }

       publicoverridevoidGetPerimeter()

        {

           doubleperimeter = 6.28 * a;

           Console.WriteLine("圆的周长是："+ perimeter);

        }

    }

   publicclassSquare:Shape

    {

       publicdoublea;

       publicdoubleb;

       publicSquare(doublea,doubleb)

        {

           this.a = a;

           this.b = b;

        }

       publicoverridevoidGetArea()

        {

           doublearea = a * b;

           Console.WriteLine("矩形的面积是："+ area);

        }

       publicoverridevoidGetPerimeter()

        {

           doubleperimeter = 2 * (a + b);

           Console.WriteLine("矩形的周长是："+ perimeter);

        }

    }

}