C#的delegate与C的函数指针

 1      #include <stdio.h>
 2   
 3       // 减法运算
 4       int minus(int a, int b) {
 5           return a - b;
 6       }
 7   
 8       // 加法运算
 9       int sum(int a, int b) {
10          return a + b;
11      }
12  
13      // 这个counting函数是用来做a和b之间的计算，至于做加法还是减法运算，由函数的第1个参数决定
14      void counting( int (*p)(int, int) , int a, int b) {
15          int result = p(a, b);
16          printf("计算结果为：%d\n", result);
17      }
18  
19      int main()
20      {
21          // 进行加法运算
22          counting(sum, 6, 4);
23          
24          // 进行减法运算
25          counting(minus, 6, 4);
26          
27          return 0;
28      }

 1    class UpStatic
 2     {
 3         public delegate int calculate(int a, int b);
 4         public int add(int a, int b)
 5         {
 6             return a + b;
 7         }
 8         public int minus(int a, int b)
 9         {
10             return a - b;
11         }
12         public int multiply(int a, int b)
13         {
14             return a * b;
15         }
16         public int count(int a, int b, calculate c)
17         {
18             int result = c(a, b);
19             return result;
20         }
21 }
22 
23     class Program
24     {
25 
26         static void Main(string[] args)
27         {
28             var test = new UpStatic();
29             int p = test.count(44, 44, test.add);
30             int q = test.count(44, 44, test.minus);
31             int r = test.count(44, 44, test.multiply);
32             Console.WriteLine(p);
33             Console.WriteLine(q);
34             Console.WriteLine(r);
35             Console.Read();
36         }
37     }