停车场管理系统数据结构C语言

停车场管理系统数据结构可以用C语言实现，以下是一个简单的示例：

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

#define MAX_CARS 50

struct Car {
    char license_plate[10];
    int entry_time;
    int exit_time;
};

struct ParkingLot {
    struct Car cars[MAX_CARS];
    int num_cars;
};

void add_car(struct ParkingLot *parking_lot, char *license_plate, int entry_time) {
    if (parking_lot->num_cars >= MAX_CARS) {
        printf("Parking lot is full.\n");
        return;
    }
    struct Car car;
    strcpy(car.license_plate, license_plate);
    car.entry_time = entry_time;
    car.exit_time = -1;
    parking_lot->cars[parking_lot->num_cars] = car;
    parking_lot->num_cars++;
    printf("Car with license plate %s added to the parking lot.\n", license_plate);
}

void remove_car(struct ParkingLot *parking_lot, char *license_plate, int exit_time) {
    int i;
    for (i = 0; i < parking_lot->num_cars; i++) {
        if (strcmp(parking_lot->cars[i].license_plate, license_plate) == 0) {
            if (parking_lot->cars[i].exit_time != -1) {
                printf("Car with license plate %s has already left the parking lot.\n", license_plate);
            } else {
                parking_lot->cars[i].exit_time = exit_time;
                printf("Car with license plate %s has left the parking lot.\n", license_plate);
            }
            return;
        }
    }
    printf("Car with license plate %s not found in the parking lot.\n", license_plate);
}

void print_parking_lot(struct ParkingLot *parking_lot) {
    int i;
    for (i = 0; i < parking_lot->num_cars; i++) {
        printf("Car with license plate %s entered at %d", parking_lot->cars[i].license_plate, parking_lot->cars[i].entry_time);
        if (parking_lot->cars[i].exit_time != -1) {
            printf(" and exited at %d", parking_lot->cars[i].exit_time);
        }
        printf("\n");
    }
}

int main() {
    struct ParkingLot parking_lot;
    parking_lot.num_cars = 0;

    add_car(&parking_lot, "ABC123", 1000);
    add_car(&parking_lot, "DEF456", 1030);
    add_car(&parking_lot, "GHI789", 1100);

    remove_car(&parking_lot, "DEF456", 1200);

    print_parking_lot(&parking_lot);

    return 0;
}

这个示例中，我们使用了两个结构体：`Car` 和 `ParkingLot`。`Car` 结构体包含车牌号、进入时间和离开时间。`ParkingLot` 结构体包含一个 `Car` 数组和当前停车场中汽车的数量。

我们定义了三个函数：`add_car`、`remove_car` 和 `print_parking_lot`。`add_car` 函数用于添加车辆到停车场，`remove_car` 函数用于移除停车场中的车辆，`print_parking_lot` 函数用于打印当前停车场中的所有车辆信息。

在 `main` 函数中，我们创建了一个 `ParkingLot` 结构体，并使用 `add_car` 函数添加了三辆车。然后，我们使用 `remove_car` 函数将一辆车移除，并使用 `print_parking_lot` 函数打印当前停车场中所有车辆的信息。

这个示例只是一个简单的停车场管理系统的数据结构，实际应用中可能需要更复杂的功能和更复杂的数据结构。