static void Main(string[] args)
{
Rectangle rect = new Rectangle();
double x = 200;
double y = 300;
Console.WriteLine("矩形的面积为：{0}", rect.Area(x, y));
Console.WriteLine("矩形的周长为：{0}", rect.Perimeter(x, y));
Console.ReadKey();
}
static void Main(string[] args)
{
//求圆面积，跟矩形周长和面积,使用抽象类的方法实现
Calculate Cyl = new Circle(5.3);
Console.WriteLine(Cyl.Area());
Console.WriteLine(Cyl.Perimeter());
Calculate Rec = new Rectangle(5, 3);
Console.WriteLine(Rec.Area());
Console.WriteLine(Rec.Perimeter());
}
