C#类的多态性：求图形的面积

来源：互联网发布：shopnc java 源码编辑：程序博客网时间：2024/06/10 14:21
1）、代码：
using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace shap{    public class shap    {        public virtual void MyArea()        {            Console.WriteLine("no use");        }    }    public class circle : shap    {        double r, carea;        public circle(double r)        {            this.r = r;        }        public override void MyArea()        {            carea = Math.PI * r * r;            Console.WriteLine("该圆形的面积为{0}", carea);        }    }    public class triangle : shap    {        double tarea, hemiline, h;        public triangle(double hemiline, double h)        {            this.hemiline = hemiline;            this.h = h;        }        public override void MyArea()        {            tarea = hemiline * h / 2;            Console.WriteLine("hemiline={0},h={1}", hemiline, h);            Console.WriteLine("该圆形的面积为{0}", tarea);        }    }    class Program    {        static void Main(string[] args)        {            for (int i = 0; i < 100; i++)            {                Console.WriteLine("请输入你选择你要计算的图形类型：");                Console.WriteLine("1.circle(圆形面积)");                Console.WriteLine("2.triangle(三角形的面积)");                int s1 = Convert.ToInt32(Console.ReadLine());                switch (s1)                {                    case 1:                        Console.WriteLine("请输入圆的半径r:");                        int r;                        r = Int32.Parse(Console.ReadLine());                        shap MyShape;                        MyShape = new circle(r);                        MyShape.MyArea();                        break;                    case 2:                        Console.WriteLine("请输入三角形的高h,宽íhemiline:");                        int h, hemiline;                        h = Int32.Parse(Console.ReadLine());                        hemiline = Int32.Parse(Console.ReadLine());                        MyShape = new triangle(hemiline, h);                        MyShape.MyArea();                        break;                    default:                        Console.WriteLine("您输入有误，请重新输入!");                        break;                }            }        }    }}
2）、实验结果截图：
这里写图片描述
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