c#重载

using System;
using System.Collections.Generic;
using System.Text;

namespace 方法重载
{
    class area
    {
        public static double AREA(double r)
        {
            double pi = 3.14, j=0;
            j = r * r * pi;
            return j;
        }
        public static double AREA(double h,double l)
        {
            double  j = 0;
            j = h*l;
            return j;
        }
        public static void AREA()
        {
            Console.WriteLine("请输入正方形的边长");
            double b = 0, j = 0;
            b = Convert.ToDouble(Console.ReadLine());
            j = b * b;
            Console.WriteLine("正方形的面积为{0}",j);


        }
    }
}

using System;
using System.Collections.Generic;
using System.Text;

namespace 方法重载
{
    class no_static
    {
        public  double AREA(double r)
        {
            double pi = 3.14, j = 0;
            j = r * r * pi;
            return j;
        }
        public  double AREA(double h, double l)
        {
            double j = 0;
            j = h * l;
            return j;
        }
        public  void AREA()
        {
            Console.WriteLine("请输入正方形的边长");
            double b = 0, j = 0;
            b = Convert.ToDouble(Console.ReadLine());
            j = b * b;
            Console.WriteLine("正方形的面积为{0}", j);


        }
    }
}

using System;

namespace 方法重载
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Hello World!");
            int i=0,o=0;double h = 0, k = 0;
            Console.WriteLine("请输入你要求图形的序号");
            Console.WriteLine("1、圆形");
            Console.WriteLine("2、长方形");
            Console.WriteLine("3、正方形");
            i = int.Parse(Console.ReadLine());
            switch (i)
            {
                case 1:
                    Console.WriteLine("请输入半径");
                    h =double.Parse(Console.ReadLine());
                    Console.WriteLine("圆形面积为：{0}",area.AREA(h) );  break;
                case 2:
                    Console.WriteLine("请输入长和宽");
                    h = double.Parse(Console.ReadLine());
                    k = double.Parse(Console.ReadLine());
                    Console.WriteLine("长方形面积为：{0}", area.AREA(h, k));; break;
                case 3:
                    area.AREA(); break;
                default:
                    break;
            }
            Console.WriteLine("请输入你要求图形的序号");
            Console.WriteLine("1、圆形");
            Console.WriteLine("2、长方形");
            Console.WriteLine("3、正方形");
            o = int.Parse(Console.ReadLine());
            switch (o)
            {
                case 1:
                    Console.WriteLine("请输入半径");
                    h = double.Parse(Console.ReadLine());
                    no_static a = new no_static();
                    Console.WriteLine("圆形面积为：{0}", a.AREA(h)); break;
                case 2:
                    Console.WriteLine("请输入长和宽");
                    h = double.Parse(Console.ReadLine());
                    k = double.Parse(Console.ReadLine());
                    no_static aa = new no_static();
                    Console.WriteLine("长方形面积为：{0}", aa.AREA(h, k)); ; break;
                case 3:
                    no_static aaa = new no_static();
                    aaa.AREA(); break;
                default:
                    break;
            }
            Console.ReadLine();
            
        }
    }
}