class1.cs

Csharp实例编程百例.rar

using System;

namespace testClassApp
{
	/// <summary>
	/// Class1 的摘要说明。
	/// </summary>
	class Class1
	{
		/// <summary>
		/// 应用程序的主入口点。
		/// </summary>
		[STAThread]
		static void Main(string[] args)
		{
			//
			// TODO: 在此处添加代码以启动应用程序
			//

			double len = 2.5;
			double wid = 3.0;
			double rad = 4.1;
			Rectangle aRect = new Rectangle();
			aRect.length = len;
			aRect.width = wid;
			Circle aCirc = new Circle (rad);
			Console.WriteLine ("Area of Rect is:{0}",aRect.Area ());
			Console.WriteLine ("Area of Circ is:{0}",aCirc.Area ());
		}
	}

	abstract class Shape				//抽象基类，不可实例化
	{
		public const double pi=3.14;	//常量
		protected double x, y;			//私有，可继承变量

		public Shape()					//默认构造函数
		{
			x=y=0;
		}
		public Shape(double x,double y)	//带参数构造函数
		{
			this.x = x;
			this.y = y;
		}
		public abstract double Area();	//抽象方法，需重载
	}

	class Rectangle: Shape
	{
		public Rectangle():base(){}
		public Rectangle(double x, double y): base(x,y){}//使用基类构造函数
		public override double Area()	//函数重载
		{
			return (x*y);
		}
		public double length	//属性：矩形长度
		{
			get
			{
				return x;
			}
			set
			{
				if (value>0){x = value;}
			}
		}
		public double width		//属性：矩形宽度
		{
			get
			{
				return y;
			}
			set
			{
				if (value>0){y = value;}
			}
		}

	}

	class Ellipse: Shape
	{
		public Ellipse(double x, double y):base(x,y){}//使用基类Shape的构造函数
		public override double Area()	//函数重载
		{
			return pi*x*y;
		}
	}
	class Circle: Ellipse
	{
		public Circle(double r):base(r,0){}	//使用基类Ellipse的构造函数
		public override double Area()	//函数重载
		{
			return pi*x*x;
		}
	}

	
}