今日报告

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace shiyan202
{
    public interface Ishape
    {
        void initialize();
        decimal getPerimeter();
        decimal getArea();
    }
    public interface IDisplayresult
    {
        void showResult();

    }
    public class Square : Ishape, IDisplayresult
    {
        decimal l;
        public void initialize()
        {
            Console.WriteLine("请输入正方形边长：");
            do
            {
                l = decimal.Parse(Console.ReadLine());
                if (l <= 0)
                {
                    Console.WriteLine("输入数据错误，请重新输入：");
                }
            } while (l <= 0);
        }
        public decimal getPerimeter()
        {
            return 4 * l;
        }
        public decimal getArea()
        {
            return l * l;
        }
        public void showResult()
        {
            Console.WriteLine("该正方体的周长:{0}", getPerimeter());
            Console.WriteLine("该正方体的面积:{0}", getArea());
        }
    }
    public class Circle : Ishape, IDisplayresult
    {
        static decimal pi = 3.14M;
        decimal r;
        public void initialize()
        {
            Console.WriteLine("请输入圆形的半径：");
            do
            {
                r = decimal.Parse(Console.ReadLine());
                if (r <= 0)
                {
                    Console.WriteLine("输入数据错误，请重新输入：");
                }
            } while (r <= 0);
        }
        public decimal getPerimeter()
        {
            return 2 * r * pi;
        }
        public decimal getArea()
        {
            return pi * r * r;
        }
        public void showResult()
        {
            Console.WriteLine("该圆形的周长:{0}", getPerimeter());
            Console.WriteLine("该圆形的面积:{0}", getArea());
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            int i;
            Square sq = new Square();
            Circle cr = new Circle();
            do
            {
                Console.WriteLine("请选择 1：正方形  2：圆形  3：退出");
                i = int.Parse(Console.ReadLine());
                switch (i)
                {
                    case 1: sq.initialize(); sq.showResult(); break;
                    case 2: cr.initialize(); cr.showResult(); break;
                    case 3: Console.WriteLine("感谢您的使用！！！"); break;
                    default: Console.WriteLine("输入数据错误，请重新输入："); break;
                }
                Console.Write("\n请按任意键继续...");
                Console.ReadKey();
                Console.Clear();
            } while (i != 3);

        }
    }
}