Form1.cs

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace t6
{
    // 下载于www.51aspx.com
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        class Shape
        {
            private double mianji, zhouchang;
            public virtual double Mianji(string tuxing ,double a, double b,double c)
           {
               if (tuxing == "三角形")
               {
                   double p = (a + b + c) / 2;
                   mianji = Math.Sqrt(p * (p - a) * (p - b) * (p - c));
               }
               if (tuxing == "矩形") 
               {
                   mianji = a * b;
               }
               if (tuxing == "圆形") 
               {
                   mianji = Math.PI * a * a;
               }
               return mianji;
           }
            public virtual double Zhouchang(string tuxing, double a, double b, double c)
            {
                if (tuxing == "三角形")
                {
                    zhouchang = a + b + c;
                }
                if (tuxing == "矩形")
                {
                    zhouchang = a * 2 + b*2;
                }
                if (tuxing == "圆形")
                {
                    zhouchang = Math.PI * a * 2;
                }
                return zhouchang;
            }
        
        }
        class Tangle : Shape
        {
            private double  mianji, zhouchang;