开发一个简单的宠物信息管理系统。用C++实现，请给出源码 。要求实现以下基本功能:有简单的用户管理功能，不同用户在登录系统后会有不同的菜单可进行不同的操作。管理员可以实现以下功能:(1)宠物信息录入功能，主要包括录入宠物的编号，名字，性别，年龄，颜色，种类客户姓名和手机号(宠物信息用文件保存)。(2)宠物信息修改功能(修改后的信息也要用文件保存)。(3)宠物信息浏览功能。(4)宠物信息删除功能用户:客户可以输入自己的姓名，或者手机号查询自己的宠物信息。提交材料应包括:(1)系统源代码 2 要求采用面向对象程序设计方法进行系统设计，充分应用封装、抽象、继承、多态、重载、模板等概念完成整个课设任务。

以下是一个简单的宠物信息管理系统的C++代码实现，包含管理员和用户两种角色的功能：

#include <iostream>
#include <fstream>
#include <string>
#include <vector>

using namespace std;

class Pet {
public:
    int id;
    string name;
    string gender;
    int age;
    string color;
    string type;
    string ownerName;
    string ownerPhone;

    Pet() {}
    Pet(int _id, string _name, string _gender, int _age, string _color, string _type, string _ownerName, string _ownerPhone) {
        id = _id;
        name = _name;
        gender = _gender;
        age = _age;
        color = _color;
        type = _type;
        ownerName = _ownerName;
        ownerPhone = _ownerPhone;
    }

    void print() {
        cout << "编号：" << id << endl;
        cout << "名字：" << name << endl;
        cout << "性别：" << gender << endl;
        cout << "年龄：" << age << endl;
        cout << "颜色：" << color << endl;
        cout << "种类：" << type << endl;
        cout << "主人姓名：" << ownerName << endl;
        cout << "主人电话：" << ownerPhone << endl;
    }

    friend ofstream& operator<<(ofstream& ofs, const Pet& pet) {
        ofs << pet.id << " " << pet.name << " " << pet.gender << " " << pet.age << " " << pet.color << " " << pet.type << " " << pet.ownerName << " " << pet.ownerPhone << endl;
        return ofs;
    }

    friend ifstream& operator>>(ifstream& ifs, Pet& pet) {
        ifs >> pet.id >> pet.name >> pet.gender >> pet.age >> pet.color >> pet.type >> pet.ownerName >> pet.ownerPhone;
        return ifs;
    }
};

class User {
public:
    string name;
    string phone;

    User() {}
    User(string _name, string _phone) {
        name = _name;
        phone = _phone;
    }
};

class PetStore {
private:
    vector<Pet> pets;
    vector<User> users;

public:
    void loadPets() {
        ifstream ifs("pets.txt");
        if (!ifs) {
            cout << "无法打开文件！" << endl;
            return;
        }

        pets.clear();

        Pet pet;
        while (ifs >> pet) {
            pets.push_back(pet);
        }
        ifs.close();
    }

    void savePets() {
        ofstream ofs("pets.txt");
        if (!ofs) {
            cout << "无法打开文件！" << endl;
            return;
        }

        for (Pet pet : pets) {
            ofs << pet;
        }
        ofs.close();
    }

    void loadUsers() {
        ifstream ifs("users.txt");
        if (!ifs) {
            cout << "无法打开文件！" << endl;
            return;
        }

        users.clear();

        User user;
        while (ifs >> user.name >> user.phone) {
            users.push_back(user);
        }
        ifs.close();
    }

    void saveUsers() {
        ofstream ofs("users.txt");
        if (!ofs) {
            cout << "无法打开文件！" << endl;
            return;
        }

        for (User user : users) {
            ofs << user.name << " " << user.phone << endl;
        }
        ofs.close();
    }

    void registerUser() {
        string name, phone;
        cout << "请输入用户名：";
        cin >> name;
        cout << "请输入电话号码：";
        cin >> phone;

        for (User user : users) {
            if (user.name == name) {
                cout << "该用户名已被注册，请重新输入！" << endl;
                return;
            }
        }

        users.push_back(User(name, phone));
        saveUsers();
        cout << "注册成功！" << endl;
    }

    bool loginUser(string& name) {
        string phone;
        cout << "请输入电话号码：";
        cin >> phone;

        for (User user : users) {
            if (user.phone == phone) {
                name = user.name;
                return true;
            }
        }

        cout << "该用户不存在！" << endl;
        return false;
    }

    void addPet() {
        int id, age;
        string name, gender, color, type, ownerName, ownerPhone;

        cout << "请输入宠物编号：";
        cin >> id;

        for (Pet pet : pets) {
            if (pet.id == id) {
                cout << "该宠物编号已存在，请重新输入！" << endl;
                return;
            }
        }

        cout << "请输入宠物名字：";
        cin >> name;
        cout << "请输入宠物性别（公/母）：";
        cin >> gender;
        cout << "请输入宠物年龄：";
        cin >> age;
        cout << "请输入宠物颜色：";
        cin >> color;
        cout << "请输入宠物种类：";
        cin >> type;
        cout << "请输入主人姓名：";
        cin >> ownerName;
        cout << "请输入主人电话：";
        cin >> ownerPhone;

        pets.push_back(Pet(id, name, gender, age, color, type, ownerName, ownerPhone));
        savePets();
        cout << "添加成功！" << endl;
    }

    void modifyPet() {
        int id;
        cout << "请输入要修改的宠物编号：";
        cin >> id;

        for (Pet& pet : pets) {
            if (pet.id == id) {
                pet.print();
                cout << "请输入新的宠物名字（不修改请按回车）：";
                string name;
                cin.ignore();
                getline(cin, name);
                if (name != "") {
                    pet.name = name;
                }
                cout << "请输入新的宠物性别（公/母，不修改请按回车）：";
                string gender;
                getline(cin, gender);
                if (gender != "") {
                    pet.gender = gender;
                }
                cout << "请输入新的宠物年龄（不修改请按回车）：";
                string ageStr;
                getline(cin, ageStr);
                if (ageStr != "") {
                    pet.age = stoi(ageStr);
                }
                cout << "请输入新的宠物颜色（不修改请按回车）：";
                string color;
                getline(cin, color);
                if (color != "") {
                    pet.color = color;
                }
                cout << "请输入新的宠物种类（不修改请按回车）：";
                string type;
                getline(cin, type);
                if (type != "") {
                    pet.type = type;
                }
                cout << "请输入新的主人姓名（不修改请按回车）：";
                string ownerName;
                getline(cin, ownerName);
                if (ownerName != "") {
                    pet.ownerName = ownerName;
                }
                cout << "请输入新的主人电话（不修改请按回车）：";
                string ownerPhone;
                getline(cin, ownerPhone);
                if (ownerPhone != "") {
                    pet.ownerPhone = ownerPhone;
                }
                savePets();
                cout << "修改成功！" << endl;
                return;
            }
        }

        cout << "该宠物编号不存在！" << endl;
    }

    void viewPets() {
        for (Pet pet : pets) {
            pet.print();
            cout << endl;
        }
    }

    void deletePet() {
        int id;
        cout << "请输入要删除的宠物编号：";
        cin >> id;

        for (vector<Pet>::iterator it = pets.begin(); it != pets.end(); ++it) {
            if (it->id == id) {
                pets.erase(it);
                savePets();
                cout << "删除成功！" << endl;
                return;
            }
        }

        cout << "该宠物编号不存在！" << endl;
    }
};

void adminMenu(PetStore& petStore) {
    while (true) {
        cout << "管理员菜单" << endl;
        cout << "1. 宠物信息录入" << endl;
        cout << "2. 宠物信息修改" << endl;
        cout << "3. 宠物信息浏览" << endl;
        cout << "4. 宠物信息删除" << endl;
        cout << "0. 退出" << endl;
        cout << "请选择：";
        int choice;
        cin >> choice;

        switch (choice) {
        case 1:
            petStore.addPet();
            break;
        case 2:
            petStore.modifyPet();
            break;
        case 3:
            petStore.viewPets();
            break;
        case 4:
            petStore.deletePet();
            break;
        case 0:
            return;
        default:
            cout << "选择无效，请重新选择！" << endl;
        }
    }
}

void userMenu(PetStore& petStore, string name) {
    while (true) {
        cout << "用户菜单" << endl;
        cout << "1. 查询宠物信息" << endl;
        cout << "0. 退出" << endl;
        cout << "请选择：";
        int choice;
        cin >> choice;

        switch (choice) {
        case 1:
            int count = 0;
            for (Pet pet : petStore.pets) {
                if (pet.ownerName == name || pet.ownerPhone == name) {
                    pet.print();
                    cout << endl;
                    count++;
                }
            }
            if (count == 0) {
                cout << "没有查询到任何宠物信息！" << endl;
            }
            break;
        case 0:
            return;
        default:
            cout << "选择无效，请重新选择！" << endl;
        }
    }
}

int main() {
    PetStore petStore;
    petStore.loadPets();
    petStore.loadUsers();

    while (true) {
        cout << "欢迎来到宠物信息管理系统！" << endl;
        cout << "1. 注册用户" << endl;
        cout << "2. 用户登录" << endl;
        cout << "3. 管理员登录" << endl;
        cout << "0. 退出" << endl;
        cout << "请选择：";
        int choice;
        cin >> choice;

        switch (choice) {
        case 1:
            petStore.registerUser();
            break;
        case 2:
            string name;
            if (petStore.loginUser(name)) {
                userMenu(petStore, name);
            }
            break;
        case 3:
            adminMenu(petStore);
            break;
        case 0:
            return 0;
        default:
            cout << "选择无效，请重新选择！" << endl;
        }
    }
}

注意：宠物信息和用户信息分别保存在pets.txt和users.txt文件中，每行记录表示一个宠物或一个用户，用空格分隔各字段。友元函数`operator<<`和`operator>>`分别实现Pet类到ofstream和ifstream的转换，用于读写文件。在修改宠物信息时，使用getline函数读取包含空格的字符串。