c - c 中的指针和函数

Question

请考虑以下代码

#include<stdio.h>
int fun(); /* function prototype */

int main()
{
    int (*p)() = fun;
    (*p)();  
    return 0;
}
int fun()
{
    printf("IndiaBix.com\n");
    return 0;
}

这里的int(*p)()是什么？是函数、变量还是什么？

Answer 1

流量spiral rule :

                 +------+
                 |      |
                 |  +-+ |
                 |  ^ | |            
             int ( *p ) ()
               ^ |    | |
               | +----+ |
               +--------+

               Identifier p
                 is a pointer to..
                 is a pointer to a function  
                 is a pointer to a function returning int