C++学习笔记：指向函数的指针

 #include <stdio.h>

 int sum(int a, int b)
 {
      return a+b;
 }

 int minus(int a, int b)
 {
      return a-b;
 }

 int x(int a, int b)
 {
      return a*b;
 }

//第一个参数为指向函数的指针，返回类型为int，参数是int，int

 void counting(int (*p)(int, int), int a, int b)
 {
      int result = p(a, b);
      printf("result = %d\n", result);
 }

 int main()
 {
      //指向函数的指针
      counting(sum, , );//counting(minus, 1, 2);   counting(x, 1, 2);
      ;
 }