1 #include 
     
       2  3 int sum(int a, int b) 4 { 5      return a+b; 6 } 7  8 int minus(int a, int b) 9 {10      return a-b;11 }12 13 int x(int a, int b)14 {15      return a*b;16 }
     

 

//第一个参数为指向函数的指针，返回类型为int，参数是int，int

1 void counting(int (*p)(int, int), int a, int b) 2 { 3      int result = p(a, b); 4      printf("result = %d\n", result); 5 } 6  7 int main() 8 { 9      //指向函数的指针10      counting(sum, 1, 2);//counting(minus, 1, 2);   counting(x, 1, 2);11      return 0;12 }