C语言实现停车场管理系统

这个代码实现了一个基本的停车场管理系统，包括停车、结算费用和显示停车记录等功能。你可以根据自己的需求修改代码，添加更多功能。

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

#define MAX_CAPACITY 100

typedef struct {
    int id;
    char licensePlate[10];
    int timeIn;
    int timeOut;
    float cost;
} ParkingRecord;

ParkingRecord parkingLot[MAX_CAPACITY];
int currentCapacity = 0;

void showMenu() {
    printf("Welcome to the Parking Lot Management System!\n");
    printf("1. Park a car\n");
    printf("2. Check out a car\n");
    printf("3. Show parking records\n");
    printf("4. Exit\n");
    printf("Please enter your choice: ");
}

void parkCar() {
    if (currentCapacity >= MAX_CAPACITY) {
        printf("Sorry, the parking lot is full.\n");
        return;
    }

    ParkingRecord newRecord;
    printf("Please enter the license plate number (up to 9 characters): ");
    scanf("%s", newRecord.licensePlate);
    printf("Please enter the time in (in minutes since 00:00): ");
    scanf("%d", &newRecord.timeIn);

    newRecord.id = currentCapacity + 1;
    parkingLot[currentCapacity] = newRecord;
    currentCapacity++;

    printf("The car is parked at spot %d.\n", newRecord.id);
}

void checkOutCar() {
    int id;
    printf("Please enter the parking spot number: ");
    scanf("%d", &id);

    if (id < 1 || id > currentCapacity) {
        printf("Invalid parking spot number.\n");
        return;
    }

    ParkingRecord *record = &parkingLot[id-1];
    if (record->timeOut > 0) {
        printf("The car has already been checked out.\n");
        return;
    }

    printf("Please enter the time out (in minutes since 00:00): ");
    scanf("%d", &record->timeOut);

    float hours = (record->timeOut - record->timeIn) / 60.0;
    record->cost = hours * 1.5;

    printf("The cost for parking is $%.2f.\n", record->cost);
}

void showRecords() {
    printf("Parking Records:\n");
    printf("ID\tLicense Plate\tTime In\tTime Out\tCost\n");

    for (int i = 0; i < currentCapacity; i++) {
        ParkingRecord record = parkingLot[i];
        printf("%d\t%s\t%d\t%d\t$%.2f\n", record.id, record.licensePlate,
               record.timeIn, record.timeOut, record.cost);
    }
}

int main() {
    int choice;

    do {
        showMenu();
        scanf("%d", &choice);

        switch (choice) {
            case 1:
                parkCar();
                break;
            case 2:
                checkOutCar();
                break;
            case 3:
                showRecords();
                break;
            case 4:
                printf("Thank you for using the Parking Lot Management System!\n");
                break;
            default:
                printf("Invalid choice.\n");
        }
    } while (choice != 4);

    return 0;
}

#########################分隔符########################################

接下来来解释下代码

这个代码实现了一个简单的停车场管理系统，包括停车、结算费用和显示停车记录等功能。下面是代码的主要部分：

1. 定义结构体 ParkingRecord

typedef struct {
    int id;
    char licensePlate[10];
    int timeIn;
    int timeOut;
    float cost;
} ParkingRecord;

这个结构体用来表示一条停车记录，包括停车位编号、车牌号、进入时间、离开时间和停车费用。

2. 定义数组 parkingLot 和变量 currentCapacity

ParkingRecord parkingLot[MAX_CAPACITY];
int currentCapacity = 0;

这个数组表示停车场的所有停车位，最多可以容纳 MAX_CAPACITY 辆车。变量 currentCapacity 表示当前停车场中已停车辆的数量。

3. 定义函数 showMenu

void showMenu() {
    printf("Welcome to the Parking Lot Management System!\n");
    printf("1. Park a car\n");
    printf("2. Check out a car\n");
    printf("3. Show parking records\n");
    printf("4. Exit\n");
    printf("Please enter your choice: ");
}

这个函数用来显示菜单，让用户选择相应的操作。

4. 定义函数 parkCar

void parkCar() {
    if (currentCapacity >= MAX_CAPACITY) {
        printf("Sorry, the parking lot is full.\n");
        return;
    }

    ParkingRecord newRecord;
    printf("Please enter the license plate number (up to 9 characters): ");
    scanf("%s", newRecord.licensePlate);
    printf("Please enter the time in (in minutes since 00:00): ");
    scanf("%d", &newRecord.timeIn);

    newRecord.id = currentCapacity + 1;
    parkingLot[currentCapacity] = newRecord;
    currentCapacity++;

    printf("The car is parked at spot %d.\n", newRecord.id);
}

这个函数用来实现停车功能。如果停车场已经满了，则输出提示信息并返回。否则，让用户输入车牌号和进入时间，创建一条停车记录，并将其添加到 parkingLot 数组中。最后，输出停车位编号。

5. 定义函数 checkOutCar

void checkOutCar() {
    int id;
    printf("Please enter the parking spot number: ");
    scanf("%d", &id);

    if (id < 1 || id > currentCapacity) {
        printf("Invalid parking spot number.\n");
        return;
    }

    ParkingRecord *record = &parkingLot[id-1];
    if (record->timeOut > 0) {
        printf("The car has already been checked out.\n");
        return;
    }

    printf("Please enter the time out (in minutes since 00:00): ");
    scanf("%d", &record->timeOut);

    float hours = (record->timeOut - record->timeIn) / 60.0;
    record->cost = hours * 1.5;

    printf("The cost for parking is $%.2f.\n", record->cost);
}
``

6. 定义函数 showParkingRecords

void showParkingRecords() {
    if (currentCapacity == 0) {
        printf("There is no car parked in the parking lot.\n");
        return;
    }

    printf("Parking records:\n");
    printf("ID\tLicense Plate\tTime In\tTime Out\tCost\n");

    for (int i = 0; i < currentCapacity; i++) {
        ParkingRecord record = parkingLot[i];
        printf("%d\t%s\t\t%d\t%d\t\t%.2f\n",
               record.id, record.licensePlate, record.timeIn, record.timeOut, record.cost);
    }
}

这个函数用来显示停车记录。如果当前停车场中没有车辆，则输出提示信息并返回。否则，按照指定格式输出所有停车记录。

7. 定义函数 main

int main() {
    int choice;
    do {
        showMenu();
        scanf("%d", &choice);

        switch (choice) {
            case 1:
                parkCar();
                break;
            case 2:
                checkOutCar();
                break;
            case 3:
                showParkingRecords();
                break;
            case 4:
                printf("Thank you for using the Parking Lot Management System!\n");
                break;
            default:
                printf("Invalid choice. Please try again.\n");
                break;
        }
    } while (choice != 4);

    return 0;
}

这个函数是程序的主函数，用来接收用户的输入，并根据用户的选择调用相应的函数。通过一个 do-while 循环，一直显示菜单，直到用户选择退出。