callback.c

来自「基于LINUX操作系统下的各种详细配置（如FTP」· C语言 代码 · 共 58 行

/*
 * My c note sample
 * 
 * 1. Callback
 * 2. Recursion
 *
 * 2005-12-16 11:54:22
 * Li Jay
 */

#include <stdio.h>

static int recursion_count = 0;


/*
 * Function pointer & Callback Sample
 */
static int my_callback(void (*call_back)(void))
{
    call_back();
    return 0;
}

static void print_hello(void)
{
    printf("Hello,world!\n");
}


/*
 * Recursion Sample
 */

static int add(int *array, int len)
{
    recursion_count++;

    if (len > 1) {
	return array[0] + add(++array, --len);
    } else {
	return array[0];
    }
}

int main()
{
    int result;
    int array2[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};

    my_callback(print_hello);

    result = add(array2, 10);
    printf("count time: %d\n", recursion_count);
    printf("the result is:%d\n", result);
    return 0;
}