qsort()方法作用于字符串数组的范例

#include <stdio.h>#include <stdlib.h>#include <string.h>#define MAX_REMIND 50#define MSG_LEN 60int read_line(char str[], int n);int compare_parts(const void *p, const void *q);int main(void){        char *reminders[MAX_REMIND];    char msg_str[MSG_LEN+1];        int num = 0, i;            for (;;) {        printf("Enter word: ");        if (read_line(msg_str, MSG_LEN) == '\0')            break;                reminders[num] = malloc(strlen(msg_str));        if (reminders[num] == NULL) {            printf("-- No space left --\n");            break;        }                strcpy(reminders[num], msg_str);                num++;    }    puts("");    qsort(reminders, num, sizeof(reminders[MSG_LEN]), compare_parts);    /* Si deve scritto sizeof(reminders[MSG_LEN]) */    printf("In sorted order: ");    for (i = 0; i <num; i++)        printf("%s ", reminders[i]);    puts("");        return 0;}int read_line(char str[], int n){    int ch, i = 0;        while ((ch = getchar()) != '\n')        if (i < n)            str[i++] = ch;                str[i] = '\0';    return i;}    int compare_parts(const void *p, const void *q){    return strcmp(*(char **) p, *(char **) q);    /* Si deve fare il doppio *,poi fa singolo *, per il 字符串数组*/}