用c语言表示火车系统代码

以下是一个简单的火车订票系统的 C 语言代码示例：

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

#define MAX_NAME_LEN 50
#define MAX_TRAIN_NUM 100

typedef struct {
    int train_num;
    char start_station[MAX_NAME_LEN];
    char end_station[MAX_NAME_LEN];
    float ticket_price;
    int num_tickets_available;
} Train;

Train trains[MAX_TRAIN_NUM];
int num_trains = 0;

void add_train() {
    Train new_train;
    printf("请输入火车车次号:");
    scanf("%d", &new_train.train_num);
    printf("请输入起始站:");
    scanf("%s", new_train.start_station);
    printf("请输入终点站:");
    scanf("%s", new_train.end_station);
    printf("请输入票价:");
    scanf("%f", &new_train.ticket_price);
    printf("请输入剩余票数:");
    scanf("%d", &new_train.num_tickets_available);
    trains[num_trains] = new_train;
    num_trains++;
    printf("添加火车成功!\n");
}

void search_train() {
    int train_num;
    printf("请输入要查询的火车车次号:");
    scanf("%d", &train_num);
    for (int i = 0; i < num_trains; i++) {
        if (trains[i].train_num == train_num) {
            printf("车次号: %d\n", trains[i].train_num);
            printf("起始站: %s\n", trains[i].start_station);
            printf("终点站: %s\n", trains[i].end_station);
            printf("票价: %.2f\n", trains[i].ticket_price);
            printf("剩余票数: %d\n", trains[i].num_tickets_available);
            return;
        }
    }
    printf("未找到该车次，请检查输入是否正确!\n");
}

void book_ticket() {
    int train_num;
    printf("请输入要订票的火车车次号:");
    scanf("%d", &train_num);
    for (int i = 0; i < num_trains; i++) {
        if (trains[i].train_num == train_num) {
            if (trains[i].num_tickets_available > 0) {
                trains[i].num_tickets_available--;
                printf("订票成功!\n");
            } else {
                printf("该车次已无票!\n");
            }
            return;
        }
    }
    printf("未找到该车次，请检查输入是否正确!\n");
}

void show_menu() {
    printf("欢迎使用火车订票系统\n");
    printf("1. 查询火车信息\n");
    printf("2. 添加火车信息\n");
    printf("3. 订票\n");
    printf("4. 退出\n");
    printf("请选择操作:");
}

int main() {
    int choice = 0;
    while (1) {
        show_menu();
        scanf("%d", &choice);
        switch (choice) {
            case 1:
                search_train();
                break;
            case 2:
                add_train();
                break;
            case 3:
                book_ticket();
                break;
            case 4:
                exit(0);
            default:
                printf("无效操作，请重新选择!\n");
        }
    }
    return 0;
}

注意：以上代码仅为示例，实际开发中需要根据具体需求进行修改和完善。同时，为了保证系统稳定性和安全性，还需要考虑其他因素，如输入参数检查、防止 SQL 注入等。