#include <stdio.h>

void hello_num(int num)
{
	int i;
	for(i = 0; i < num; i++)
		printf("hello world, num is %d\n",i);
}

void hello(void)
{
	printf("hello world, no num\n");
}

void main()
{
	/*函數指針定義及初始化*/
	void (*p)() = hello_num;
	int a = 5;
	/*函數指針的調用方式*/
	(*p)(a);
	/*將函數指針指向另一個函數*/
	p = hello;
	/*再次調用函數指針*/
	(*p)();
}