C#中结构数据类型的使用

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using System.Threading.Tasks;
 6 
 7 namespace ConsoleApplication4
 8 {
 9 
10     class Program
11     {
12         public struct Rect
13         {
14             public double width;
15             public double height;
16             public Rect(double x, double y)
17             {
18                 width = x;
19                 height = y;
20             }
21             public double Area()
22             {
23                 return width * height;
24             }
25 
26             static void Main(string[] args)
27             {
28                 Rect rect1;
29                 rect1.width = 5;
30                 rect1.height = 3;
31                 Console.WriteLine("矩形面积为： " + rect1.Area());
32                 Rect rect2 = new Rect(4, 6);
33                 Console.WriteLine("矩形面积为： " + rect2.Area());
34 
35                 Console.Read();
36 
37             }
38         }
39     }
40 }