编辑代码

using System;
namespace RectangleApplication
{
    class Rectangle
    {
        double length;
        double width;
        public void Acceptdetails()
        {
            length=4.5;
            width=3.5;
        }
        public double GetArea()
        {
            return length*width;
        }
        public void Display()
        {
            Console.WriteLine("Length:{0}",length);
            Console.WriteLine("Width:{0}",width);
            Console.WriteLine("Area:{0}",GetArea());
        }
    }

    class ExecuteRectangle
    {
        static void Main(string[] args)
        {
            Rectangle r = new Rectangle();
            r.Acceptdetails();
            r.Display();
            Console.ReadLine();
        }
    }
}