在底层待的时间太长,竟还没接触这种回调函数的思想,有一次面试时碰到了,惭愧啊
- /* para_callback.h */
- #ifndef PARA_CALLBACK_H
- #define PARA_CALLBACK_H
- typedef void (*callback_t)(void *);
- extern void repeat_three_times(callback_t, void *);
- #endif
- void repeat_three_times(callback_t f, void *para)
- {
- f(para);
- f(para);
- f(para);
- }
- /* main.c */
- #include <stdio.h>
- void say_hello(void *str)
- {
- printf("Hello %s\n", (const char *)str);
- }
- void count_numbers(void *num)
- {
- int i;
- for(i=1; i<=(int)num; i++)
- printf("%d ", i);
- putchar('\n');
- }
- int main(void)
- {
- repeat_three_times(say_hello, "Guys");
- repeat_three_times(count_numbers, (void *)4);
- return 0;
- }
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