第13章 字符串精要.ppt

Program: Printing a One-Month Reminder List：日程表 Enter day and reminder: 24 Susans birthday Enter day and reminder: 5 6:00 - Dinner with Marge and Russ Enter day and reminder: 26 Movie - Chinatown Enter day and reminder: 7 10:30 - Dental appointment Enter day and reminder: 12 Movie - Dazed and Confused Enter day and reminder: 5 Saturday class Enter day and reminder: 12 Saturday class Enter day and reminder: 0 ? Day Reminder 5 Saturday class 5 6:00 - Dinner with Marge and Russ 7 10:30 - Dental appointment 12 Saturday class 12 Movie - Dazed and Confused“ 24 Susans birthday 26 Movie - Chinatown * Program: Printing a One-Month Reminder List Overall strategy: 分别读日期和提醒，并组合字符串 scanf(%2d, day); read_line(); sprintf(day_str, %2d, day); 按日期顺序存入二维字符数组 显示 * 温故而知新——字符串处理函数 char *strcpy(char *s1, const char *s2); strncpy(str1, str2, sizeof(str1) - 1); size_t strlen(const char *s); char *strcat(char *s1, const char *s2); strncat(str1, str2, sizeof(str1) - strlen(str1) - 1); int strcmp(const char *s1, const char *s2); * remind.c? /* Prints a one-month reminder list */ ? #include stdio.h #include string.h? #define MAX_REMIND 50 /*maximum number of reminders */ #define MSG_LEN 60 /*max length of reminder message*/ ? int read_line(char str[], int n);? int main(void) { char reminders[MAX_REMIND][MSG_LEN+3]; char day_str[3], msg_str[MSG_LEN+1]; int day, i, j, num_remind = 0; ? for (;;) { if (num_remind == MAX_REMIND) { printf(-- No space left --\n); break; } * printf(Enter day and reminder: ); scanf(%2d, day); if (day == 0) break; sprintf(day_str, “%2d”, day);//补空格 read_line(msg_str, MSG_LEN); ? for (i = 0; i num_remind; i++)//定位 if (strcmp(day_str, reminders[i]) 0) break; for (j = num_remind; j i; j--)//移动 strcpy(reminders[j], reminders[j-1]); ? strcpy(reminders[i], day_str); strcat(reminders[i], msg_str); ? num_remind++; } ? printf(\nDay Reminder\n); for (i = 0; i num