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();
        }
    }
}