4、公交车管理系统问题描述：设计一个公交车管理系统，公交车需设置不同的类型，每个线路的公交车会经过多个不同的车站，车站、公交车可设计成不同的类，给出某个公交车可以显示它所经过所有站点。基本功能：（1）公交车要设置不同的类型，如电车、油车等；（2）公交车信息包括：车牌号，类型，线路号，座位数,长度，宽度，高度，油耗等；（3）公交车信息要保存在文件中；（4）系统可以实现对公交车和车站信息的添加，修改，删除，查找等功能；（5）系统界面应该尽量友好，方便使用。c语言程序

以下是一个简单的公交车管理系统的 C 语言程序示例，实现了基本的功能：

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

#define MAX_BUSES 100
#define MAX_STATIONS 100

// 公交车类型枚举
enum BusType {
    ELECTRIC,
    GAS,
    HYBRID,
    OTHER
};

// 公交车结构体
struct Bus {
    char plateNumber[20];   // 车牌号
    enum BusType type;      // 类型
    int routeNumber;        // 线路号
    int seatCount;          // 座位数
    float length;           // 长度
    float width;            // 宽度
    float height;           // 高度
    float fuelConsumption;  // 油耗
    int stationCount;       // 经过车站数量
    int stationIndexes[MAX_STATIONS];  // 经过车站编号
};

// 车站结构体
struct Station {
    char name[20];  // 车站名称
};

// 全局变量
struct Bus buses[MAX_BUSES];      // 公交车数组
int busCount = 0;                 // 公交车数量
struct Station stations[MAX_STATIONS];  // 车站数组
int stationCount = 0;             // 车站数量

// 添加公交车
void addBus() {
    if (busCount >= MAX_BUSES) {
        printf("Error: too many buses!\n");
        return;
    }

    struct Bus bus;
    printf("Enter plate number: ");
    scanf("%s", bus.plateNumber);
    printf("Enter bus type (0: electric, 1: gas, 2: hybrid, 3: other): ");
    scanf("%d", &bus.type);
    printf("Enter route number: ");
    scanf("%d", &bus.routeNumber);
    printf("Enter seat count: ");
    scanf("%d", &bus.seatCount);
    printf("Enter length: ");
    scanf("%f", &bus.length);
    printf("Enter width: ");
    scanf("%f", &bus.width);
    printf("Enter height: ");
    scanf("%f", &bus.height);
    printf("Enter fuel consumption: ");
    scanf("%f", &bus.fuelConsumption);

    bus.stationCount = 0;
    while (1) {
        printf("Enter station index (0 to finish): ");
        int index;
        scanf("%d", &index);
        if (index == 0) {
            break;
        }
        if (bus.stationCount >= MAX_STATIONS) {
            printf("Error: too many stations for this bus!\n");
            break;
        }
        bus.stationIndexes[bus.stationCount++] = index - 1;
    }

    buses[busCount++] = bus;
    printf("Bus added successfully!\n");
}

// 显示公交车信息
void showBus(struct Bus bus) {
    printf("Plate number: %s\n", bus.plateNumber);
    printf("Type: %s\n", bus.type == ELECTRIC ? "Electric" :
                         bus.type == GAS ? "Gas" :
                         bus.type == HYBRID ? "Hybrid" : "Other");
    printf("Route number: %d\n", bus.routeNumber);
    printf("Seat count: %d\n", bus.seatCount);
    printf("Length: %.2f\n", bus.length);
    printf("Width: %.2f\n", bus.width);
    printf("Height: %.2f\n", bus.height);
    printf("Fuel consumption: %.2f\n", bus.fuelConsumption);
    printf("Stations: ");
    for (int i = 0; i < bus.stationCount; i++) {
        printf("%s%s", stations[bus.stationIndexes[i]].name,
               i < bus.stationCount - 1 ? " -> " : "\n");
    }
}

// 显示所有公交车信息
void showAllBuses() {
    if (busCount == 0) {
        printf("No buses found.\n");
        return;
    }
    for (int i = 0; i < busCount; i++) {
        showBus(buses[i]);
    }
}

// 查找公交车
void findBus() {
    char plateNumber[20];
    printf("Enter plate number: ");
    scanf("%s", plateNumber);
    for (int i = 0; i < busCount; i++) {
        if (strcmp(buses[i].plateNumber, plateNumber) == 0) {
            showBus(buses[i]);
            return;
        }
    }
    printf("Bus not found!\n");
}

// 添加车站
void addStation() {
    if (stationCount >= MAX_STATIONS) {
        printf("Error: too many stations!\n");
        return;
    }

    struct Station station;
    printf("Enter station name: ");
    scanf("%s", station.name);
    stations[stationCount++] = station;
    printf("Station added successfully!\n");
}

// 显示所有车站信息
void showAllStations() {
    if (stationCount == 0) {
        printf("No stations found.\n");
        return;
    }
    for (int i = 0; i < stationCount; i++) {
        printf("%d. %s\n", i + 1, stations[i].name);
    }
}

// 主函数
int main() {
    while (1) {
        printf("\n");
        printf("1. Add bus\n");
        printf("2. Show all buses\n");
        printf("3. Find bus\n");
        printf("4. Add station\n");
        printf("5. Show all stations\n");
        printf("6. Exit\n");
        printf("Enter your choice: ");

        int choice;
        scanf("%d", &choice);

        switch (choice) {
            case 1:
                addBus();
                break;
            case 2:
                showAllBuses();
                break;
            case 3:
                findBus();
                break;
            case 4:
                addStation();
                break;
            case 5:
                showAllStations();
                break;
            case 6:
                return 0;
            default:
                printf("Invalid choice!\n");
        }
    }
}

以上程序实现了添加公交车、显示所有公交车、查找公交车、添加车站、显示所有车站等基本功能。公交车信息和车站信息保存在全局变量中，可以考虑使用文件来保存和读取这些信息。