用C语言写一个车票管理系统，要求录入班次信息（信息用文件保存），可以不定时的增加班次数据，浏览班次信息，可显示所有班次当前的状态（如果当前系统时间超过了某班次的发车时间，显示“此版已发出”的提示信息）

以下是一个简单的车票管理系统的 C 代码示例，实现了录入班次信息、增加班次数据、浏览班次信息和显示班次状态的功能。班次信息存储在一个文本文件中，每行记录一个班次的信息，包括班次号、起点、终点、发车时间和票价等。具体实现细节可以根据需要进行修改和完善。

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>

#define MAX_LINE_LEN 100
#define MAX_SCHEDULES 100

struct Schedule {
    char number[20];
    char from[20];
    char to[20];
    char time[20];
    int price;
};

// 读取班次信息
int read_schedules(struct Schedule schedules[]) {
    FILE *fp = fopen("schedules.txt", "r");
    if (fp == NULL) {
        printf("failed to open file schedules.txt\n");
        return 0;
    }
    int count = 0;
    char line[MAX_LINE_LEN];
    while (fgets(line, MAX_LINE_LEN, fp) != NULL) {
        if (count >= MAX_SCHEDULES) {
            printf("maximum number of schedules reached\n");
            break;
        }
        sscanf(line, "%s %s %s %s %d", schedules[count].number, schedules[count].from, schedules[count].to, schedules[count].time, &schedules[count].price);
        count++;
    }
    fclose(fp);
    return count;
}

// 保存班次信息
void save_schedules(struct Schedule schedules[], int count) {
    FILE *fp = fopen("schedules.txt", "w");
    if (fp == NULL) {
        printf("failed to open file schedules.txt\n");
        return;
    }
    for (int i = 0; i < count; i++) {
        fprintf(fp, "%s %s %s %s %d\n", schedules[i].number, schedules[i].from, schedules[i].to, schedules[i].time, schedules[i].price);
    }
    fclose(fp);
}

// 增加班次信息
void add_schedule(struct Schedule schedules[], int *count) {
    if (*count >= MAX_SCHEDULES) {
        printf("maximum number of schedules reached\n");
        return;
    }
    printf("enter schedule number: ");
    scanf("%s", schedules[*count].number);
    printf("enter from: ");
    scanf("%s", schedules[*count].from);
    printf("enter to: ");
    scanf("%s", schedules[*count].to);
    printf("enter time (YYYY-MM-DD HH:MM): ");
    scanf("%s", schedules[*count].time);
    printf("enter price: ");
    scanf("%d", &schedules[*count].price);
    (*count)++;
    save_schedules(schedules, *count);
}

// 浏览班次信息
void view_schedules(struct Schedule schedules[], int count) {
    printf("schedule number\tfrom\tto\ttime\tprice\n");
    for (int i = 0; i < count; i++) {
        printf("%s\t\t%s\t%s\t%s\t%d\n", schedules[i].number, schedules[i].from, schedules[i].to, schedules[i].time, schedules[i].price);
    }
}

// 显示班次状态
void show_schedule_status(struct Schedule schedule) {
    struct tm now = *localtime(&(time_t){time(NULL)});
    struct tm time = {0};
    sscanf(schedule.time, "%d-%d-%d %d:%d", &time.tm_year, &time.tm_mon, &time.tm_mday, &time.tm_hour, &time.tm_min);
    time.tm_year -= 1900;
    time.tm_mon--;
    time_t now_t = mktime(&now);
    time_t time_t = mktime(&time);
    if (now_t >= time_t) {
        printf("schedule %s has departed\n", schedule.number);
    } else {
        printf("schedule %s is scheduled to depart at %s\n", schedule.number, schedule.time);
    }
}

int main() {
    struct Schedule schedules[MAX_SCHEDULES];
    int count = read_schedules(schedules);
    if (count == 0) {
        return 1;
    }
    int choice;
    do {
        printf("\n1. add schedule\n2. view schedules\n3. show schedule status\n0. exit\n");
        printf("enter your choice: ");
        scanf("%d", &choice);
        switch (choice) {
            case 1:
                add_schedule(schedules, &count);
                break;
            case 2:
                view_schedules(schedules, count);
                break;
            case 3:
                printf("enter schedule number: ");
                char number[20];
                scanf("%s", number);
                for (int i = 0; i < count; i++) {
                    if (strcmp(schedules[i].number, number) == 0) {
                        show_schedule_status(schedules[i]);
                        break;
                    }
                    if (i == count - 1) {
                        printf("schedule not found\n");
                    }
                }
                break;
            case 0:
                break;
            default:
                printf("invalid choice\n");
                break;
        }
    } while (choice != 0);
    return 0;
}