C语言 实现飞机订票问题

Question

飞机订票 问题描述： 某公司每天有10航班(航班号、价格)，每个航班的飞机，共有80个坐位，分20排，每排4个位子。编号为A，B，C，D。如座位号：10D表示10排D座。设计一程序，完成以下功能：

1.能从文件中导入订票信息
2.能从键盘录入订票信息，：乘客姓名，身份证 号，航班号，乘坐日期，座位号
3.能根据身份证，航班号，乘坐日期修改乘坐座位
4.能根据身份证，航班号，乘坐日期删除订票信息
5.查询指定航班，指定日期的乘客信息
6.能根据航班日期计算销售额
7.能将订票信息保存文件

Answer 1

该回答引用ChatGPT
这个问题需要设计一个航班订票系统，涉及许多功能模块，下面是大致的代码实现思路，具体实现还需要自行完成。

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

#define MAX_FLIGHTS 10
#define ROWS 20
#define SEATS_PER_ROW 4
#define SEATS_PER_FLIGHT (ROWS*SEATS_PER_ROW)

// 定义订票信息的结构体
typedef struct {
    char name[20];
    char id[20];
    char flight[10];
    char date[10];
    char seat[5];
} Reservation;

// 定义航班信息的结构体
typedef struct {
    char flight[10];
    int price;
    int seats[ROWS][SEATS_PER_ROW];
} Flight;

// 定义全局变量
Flight flights[MAX_FLIGHTS];
int num_flights = 0;
Reservation reservations[SEATS_PER_FLIGHT*MAX_FLIGHTS];
int num_reservations = 0;

// 从文件中导入航班信息
void load_flights(const char *filename) {
    FILE *fp = fopen(filename, "r");
    if (fp) {
        while (num_flights < MAX_FLIGHTS && fscanf(fp, "%s %d", flights[num_flights].flight, &flights[num_flights].price) == 2) {
            for (int i = 0; i < ROWS; i++) {
                for (int j = 0; j < SEATS_PER_ROW; j++) {
                    flights[num_flights].seats[i][j] = 0; // 0 表示空座位
                }
            }
            num_flights++;
        }
        fclose(fp);
    }
}

// 从键盘录入订票信息
void make_reservation() {
    // 从标准输入读取订票信息，存入一个临时的 Reservation 结构体中
    Reservation temp;
    printf("Name: ");
    scanf("%s", temp.name);
    printf("ID: ");
    scanf("%s", temp.id);
    printf("Flight: ");
    scanf("%s", temp.flight);
    printf("Date: ");
    scanf("%s", temp.date);
    printf("Seat: ");
    scanf("%s", temp.seat);

    // 在航班信息中查找该航班，如果存在则更新相应的座位信息，否则返回错误信息
    int found = 0;
    for (int i = 0; i < num_flights; i++) {
        if (strcmp(flights[i].flight, temp.flight) == 0) {
            int row = temp.seat[0] - '0' - 1;
            int col = temp.seat[1] - 'A';
            if (row >= 0 && row < ROWS && col >= 0 && col < SEATS_PER_ROW && flights[i].seats[row][col] == 0) {
                flights[i].seats[row][col] = 1; // 1 表示已订票
                strcpy(reservations[num_reservations].name, temp.name);
                strcpy(reservations[num_reservations].id, temp.id);
                strcpy(reservations[num_reservations].flight, temp.flight);
                strcpy(reservations[num_reservations].date, temp.date);
                strcpy(reservations[num_reservations].seat, temp.seat);
                num_reservations++;
                found = 1;
                break;
            }
        }
    }
    if (!found) {
        printf("Error: flight not found or seat already taken.
");
    }
}

// 根据身份证，航班号，乘坐日期修改乘坐座位
void modify_reservation() {
    char id[20], flight[10], date[10], seat[5];
    printf("ID: ");
    scanf("%s", id);
    printf("Flight: ");
    scanf("%s", flight);
    printf("Date: ");
    scanf("%s", date);
    printf("Seat: ");
    scanf("%s", seat);

    // 在订票信息中查找相应的记录，如果存在则更新相应的座位信息，否则返回错误信息
    for (int i = 0; i < num_reservations; i++) {
        if (strcmp(reservations[i].id, id) == 0 && strcmp(reservations[i].flight, flight) == 0 && strcmp(reservations[i].date, date) == 0) {
            int row = seat[0] - '0' - 1;
            int col = seat[1] - 'A';
            if (row >= 0 && row < ROWS && col >= 0 && col < SEATS_PER_ROW && flights[i].seats[row][col] == 0) {
                int old_row = reservations[i].seat[0] - '0' - 1;
                int old_col = reservations[i].seat[1] - 'A';
                flights[i].seats[old_row][old_col] = 0;
                flights[i].seats[row][col] = 1;
                strcpy(reservations[i].seat, seat);
            }
            break;
        }
    }
}

// 根据身份证，航班号，乘坐日期删除订票信息
void cancel_reservation() {
    char id[20], flight[10], date[10];
    printf("ID: ");
    scanf("%s", id);
    printf("Flight: ");
    scanf("%s", flight);
    printf("Date: ");
    scanf("%s", date);

    // 在订票信息中查找相应的记录，如果存在则删除该记录，否则返回错误信息
    for (int i = 0; i < num_reservations; i++) {
        if (strcmp(reservations[i].id, id) == 0 && strcmp(reservations[i].flight, flight) == 0 && strcmp(reservations[i].date, date) == 0) {
            int row = reservations[i].seat[0] - '0' - 1;
            int col = reservations[i].seat[1] - 'A';
            flights[i].seats[row][col] = 0;
            for (int j = i; j < num_reservations-1; j++) {
                reservations[j] = reservations[j+1];
            }
            num_reservations--;
            break;
        }
    }
}

// 查询指定航班，指定日期的乘客信息
void list_passengers() {
    char flight[10], date[10];
    printf("Flight: ");
    scanf("%s", flight);
    printf("Date: ");
    scanf("%s", date);

    // 在订票信息中查找相应的记录，如果存在则返回相应的乘客信息，否则返回错误信息
    printf("%-20s%-20s%-20s%-10s%-10s
", "Name", "ID", "Flight", "Date", "Seat");
    for (int i = 0; i < num_reservations; i++) {
        if (strcmp(reservations[i].flight, flight) == 0 && strcmp(reservations[i].date, date) == 0) {
            printf("%-20s%-20s%-20s%-10s%-10s
", reservations[i].name, reservations[i].id, reservations[i].flight, reservations[i].date, reservations[i].seat);
        }
    }
}

// 根据航班日期计算销售额
void calculate_revenue() {
    char flight[10], date[10];
    printf("Flight: ");
    scanf("%s", flight);
    printf("Date: ");
    scanf("%s", date);

    // 在订票信息中查找相应的记录，如果存在则累加销售额，否则返回错误信息
    int revenue = 0;
    for (int i = 0; i < num_reservations; i++) {
        if (strcmp(reservations[i].flight, flight) == 0 && strcmp(reservations[i].date, date) == 0) {
            for (int j = 0; j < num_flights; j++) {
                if (strcmp(flights[j].flight, flight) == 0) {
                    revenue += flights[j].price;
                    break;
                }
            }
        }
    }
    printf("Revenue: %d
", revenue);
}

// 将订票信息保存到文件
void save_reservations(const char *filename) {
    FILE *fp = fopen(filename, "w");
    if (fp) {
        for (int i = 0; i < num_reservations; i++) {
            fprintf(fp, "%s %s %s %s %s
", reservations[i].name, reservations[i].id, reservations[i].flight, reservations[i].date, reservations[i].seat);
        }
        fclose(fp);
    }
}

// 主函数
int main() {
    // 从文件中导入航班信息
    load_flights("flights.txt");

    // 循环处理用户的输入，直到用户输入 quit
    char command[10];
    while (1) {
        printf("Enter a command (make, modify, cancel, list, revenue, save, quit): ");
        scanf("%s", command);
        if (strcmp(command, "make") == 0) {
            make_reservation();
        } else if (strcmp(command, "modify") == 0) {
            modify_reservation();
        } else if (strcmp(command, "cancel") == 0) {
            cancel_reservation();
        } else if (strcmp(command, "list") == 0) {
            list_passengers();
        } else if (strcmp(command, "revenue") == 0) {
            calculate_revenue();
        } else if (strcmp(command, "save") == 0) {
            save_reservations("reservations.txt");
        } else if (strcmp(command, "quit") == 0) {
            break;
        } else {
            printf("Invalid command.
");
        }
    }
    return 0;
}