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。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。

很高兴回答您的问题。以下是一个简单的宠物信息管理系统的C++源码，满足您的要求。

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

using namespace std;

class Pet {
protected:
    string ID;
    string name;
    string gender;
    int age;
    string color;
    string type;
    string customerName;
    string customerPhone;
public:
    Pet() {}
    Pet(string ID, string name, string gender, int age, string color, string type, string customerName, string customerPhone) {
        this->ID = ID;
        this->name = name;
        this->gender = gender;
        this->age = age;
        this->color = color;
        this->type = type;
        this->customerName = customerName;
        this->customerPhone = customerPhone;
    }

    string getID() {
        return ID;
    }
    string getName() {
        return name;
    }
    string getGender() {
        return gender;
    }
    int getAge() {
        return age;
    }
    string getColor() {
        return color;
    }
    string getType() {
        return type;
    }
    string getCustomerName() {
        return customerName;
    }
    string getCustomerPhone() {
        return customerPhone;
    }

    void setID(string ID) {
        this->ID = ID;
    }
    void setName(string name) {
        this->name = name;
    }
    void setGender(string gender) {
        this->gender = gender;
    }
    void setAge(int age) {
        this->age = age;
    }
    void setColor(string color) {
        this->color = color;
    }
    void setType(string type) {
        this->type = type;
    }
    void setCustomerName(string customerName) {
        this->customerName = customerName;
    }
    void setCustomerPhone(string customerPhone) {
        this->customerPhone = customerPhone;
    }

    void showInfo() {
        cout << "ID: " << ID << endl;
        cout << "Name: " << name << endl;
        cout << "Gender: " << gender << endl;
        cout << "Age: " << age << endl;
        cout << "Color: " << color << endl;
        cout << "Type: " << type << endl;
        cout << "Customer name: " << customerName << endl;
        cout << "Customer phone: " << customerPhone << endl;
    }
};

class UserManager {
public:
    virtual void showMenu() = 0;
};

class Admin : public UserManager {
public:
    void showMenu() {
        cout << "Please select an option:" << endl;
        cout << "1. Add a pet" << endl;
        cout << "2. Modify pet information" << endl;
        cout << "3. View pet information" << endl;
        cout << "4. Delete pet information" << endl;
        cout << "5. Exit" << endl;
    }

    void addPet() {
        cout << "Please enter the pet information:" << endl;
        string ID;
        string name;
        string gender;
        int age;
        string color;
        string type;
        string customerName;
        string customerPhone;

        cout << "ID: ";
        cin >> ID;

        cout << "Name: ";
        cin >> name;

        cout << "Gender: ";
        cin >> gender;

        cout << "Age: ";
        cin >> age;

        cout << "Color: ";
        cin >> color;

        cout << "Type: ";
        cin >> type;

        cout << "Customer name: ";
        cin >> customerName;

        cout << "Customer phone: ";
        cin >> customerPhone;

        Pet pet(ID, name, gender, age, color, type, customerName, customerPhone);

        ofstream outfile;
        outfile.open("pet.txt", ios::app);
        outfile << ID << " " << name << " " << gender << " " << age << " " << color << " " << type << " " << customerName << " " << customerPhone << endl;
        outfile.close();

        cout << "Add pet successfully!" << endl;
    }

    void modifyPet() {
        string ID;
        cout << "Please enter the ID of the pet you want to modify: ";
        cin >> ID;

        string line;
        ifstream infile;
        infile.open("pet.txt");
        ofstream outfile;
        outfile.open("temp.txt");

        bool found = false;
        while (getline(infile, line)) {
            string petID = line.substr(0, line.find(" "));
            if (petID == ID) {
                found = true;
                Pet pet;
                pet.setID(petID);
                pet.setName(line.substr(line.find(" ") + 1, line.rfind(" ") - line.find(" ") - 1));
                pet.setGender(line.substr(line.rfind(" ") + 1));
                pet.showInfo();

                int option;
                cout << "Please select an option to modify:" << endl;
                cout << "1. Name" << endl;
                cout << "2. Gender" << endl;
                cout << "3. Age" << endl;
                cout << "4. Color" << endl;
                cout << "5. Type" << endl;
                cout << "6. Customer name" << endl;
                cout << "7. Customer phone" << endl;
                cout << "8. Save and exit" << endl;
                cin >> option;

                switch (option) {
                case 1:
                    cout << "New name: ";
                    cin >> line;
                    pet.setName(line);
                    break;
                case 2:
                    cout << "New gender: ";
                    cin >> line;
                    pet.setGender(line);
                    break;
                case 3:
                    cout << "New age: ";
                    cin >> age;
                    pet.setAge(age);
                    break;
                case 4:
                    cout << "New color: ";
                    cin >> line;
                    pet.setColor(line);
                    break;
                case 5:
                    cout << "New type: ";
                    cin >> line;
                    pet.setType(line);
                    break;
                case 6:
                    cout << "New customer name: ";
                    cin >> line;
                    pet.setCustomerName(line);
                    break;
                case 7:
                    cout << "New customer phone: ";
                    cin >> line;
                    pet.setCustomerPhone(line);
                    break;
                case 8:
                    outfile << pet.getID() << " " << pet.getName() << " " << pet.getGender() << " " << pet.getAge() << " " << pet.getColor() << " " << pet.getType() << " " << pet.getCustomerName() << " " << pet.getCustomerPhone() << endl;
                    break;
                }
            }
            else {
                outfile << line << endl;
            }
        }

        infile.close();
        outfile.close();

        if (found) {
            remove("pet.txt");
            rename("temp.txt", "pet.txt");
            cout << "Modify pet information successfully!" << endl;
        }
        else {
            remove("temp.txt");
            cout << "Pet not found!" << endl;
        }
    }

    void viewPet() {
        ifstream infile;
        infile.open("pet.txt");

        string line;
        while (getline(infile, line)) {
            Pet pet;
            pet.setID(line.substr(0, line.find(" ")));
            pet.setName(line.substr(line.find(" ") + 1, line.rfind(" ") - line.find(" ") - 1));
            pet.setGender(line.substr(line.rfind(" ") + 1));
            pet.showInfo();
            cout << endl;
        }

        infile.close();
    }

    void deletePet() {
        string ID;
        cout << "Please enter the ID of the pet you want to delete: ";
        cin >> ID;

        string line;
        ifstream infile;
        infile.open("pet.txt");
        ofstream outfile;
        outfile.open("temp.txt");

        bool found = false;
        while (getline(infile, line)) {
            string petID = line.substr(0, line.find(" "));
            if (petID == ID) {
                found = true;
            }
            else {
                outfile << line << endl;
            }
        }

        infile.close();
        outfile.close();

        if (found) {
            remove("pet.txt");
            rename("temp.txt", "pet.txt");
            cout << "Delete pet information successfully!" << endl;
        }
        else {
            remove("temp.txt");
            cout << "Pet not found!" << endl;
        }
    }
};

class User : public UserManager {
public:
    void showMenu() {
        cout << "Please select an option:" << endl;
        cout << "1. Search pet by name" << endl;
        cout << "2. Search pet by customer phone" << endl;
        cout << "3. Exit" << endl;
    }

    void searchByName() {
        string name;
        cout << "Please enter the name of the pet you want to search: ";
        cin >> name;

        ifstream infile;
        infile.open("pet.txt");

        string line;
        bool found = false;
        while (getline(infile, line)) {
            string petName = line.substr(line.find(" ") + 1, line.rfind(" ") - line.find(" ") - 1);
            if (petName == name) {
                found = true;
                Pet pet;
                pet.setID(line.substr(0, line.find(" ")));
                pet.setName(petName);
                pet.setGender(line.substr(line.rfind(" ") + 1));
                pet.setAge(stoi(line.substr(line.find_last_of(" ") - 1, 1)));
                pet.setColor(line.substr(line.find(" ")+1, line.find_last_of(" ")-line.find(" ")-1));
                pet.setType(line.substr(line.find_last_of(" ")+1, line.find_last_of(petName)-line.find_last_of(" ")-2));
                pet.setCustomerName(line.substr(line.find_last_of(petName)+2, line.rfind(" ")-line.find_last_of(petName)-2));
                pet.setCustomerPhone(line.substr(line.rfind(" ")+1));

                pet.showInfo();
                cout << endl;
            }
        }

        infile.close();

        if (!found) {
            cout << "Pet not found!" << endl;
        }
    }

    void searchByPhone() {
        string phone;
        cout << "Please enter the customer phone of the pet you want to search: ";
        cin >> phone;

        ifstream infile;
        infile.open("pet.txt");

        string line;
        bool found = false;
        while (getline(infile, line)) {
            string petPhone = line.substr(line.rfind(" ") + 1);
            if (petPhone == phone) {
                found = true;
                Pet pet;
                pet.setID(line.substr(0, line.find(" ")));
                pet.setName(line.substr(line.find(" ") + 1, line.rfind(" ") - line.find(" ") - 1));
                pet.setGender(line.substr(line.rfind(" ") + 1));
                pet.setAge(stoi(line.substr(line.find_last_of(" ") - 1, 1)));
                pet.setColor(line.substr(line.find(" ")+1, line.find_last_of(" ")-line.find(" ")-1));
                pet.setType(line.substr(line.find_last_of(" ")+1, line.find_last_of(pet.getName())-line.find_last_of(" ")-2));
                pet.setCustomerName(line.substr(line.find_last_of(pet.getName())+2, line.rfind(" ")-line.find_last_of(pet.getName())-2));
                pet.setCustomerPhone(petPhone);

                pet.showInfo();
                cout << endl;
            }
        }

        infile.close();

        if (!found) {
            cout << "Pet not found!" << endl;
        }
    }
};

int main() {
    int option;
    cout << "Welcome to the pet information management system!" << endl;
    cout << "Please select your user type:" << endl;
    cout << "1. Admin" << endl;
    cout << "2. User" << endl;
    cin >> option;

    UserManager* userManager;
    if (option == 1) {
        userManager = new Admin();
    }
    else if (option == 2) {
        userManager = new User();
    }

    while (true) {
        userManager->showMenu();
        cin >> option;

        if (option == 1 && dynamic_cast<Admin*>(userManager)) {
            dynamic_cast<Admin*>(userManager)->addPet();
        }
        else if (option == 2 && dynamic_cast<Admin*>(userManager)) {
            dynamic_cast<Admin*>(userManager)->modifyPet();
        }
        else if (option == 3 && dynamic_cast<Admin*>(userManager)) {
            dynamic_cast<Admin*>(userManager)->viewPet();
        }
        else if (option == 4 && dynamic_cast<Admin*>(userManager)) {
            dynamic_cast<Admin*>(userManager)->deletePet();
        }
        else if (option == 1 && dynamic_cast<User*>(userManager)) {
            dynamic_cast<User*>(userManager)->searchByName();
        }
        else if (option == 2 && dynamic_cast<User*>(userManager)) {
            dynamic_cast<User*>(userManager)->searchByPhone();
        }
        else if (option == 3) {
            break;
        }
        else {
            cout << "Invalid option!" << endl;
        }
    }

    return 0;
}

该程序定义了一个Pet类来存储宠物信息，管理员和用户都是UserManager类的子类。管理员可以添加、修改、查看和删除宠物信息，而用户只能通过宠物名字或客户电话查询宠物信息。程序使用文件存储宠物信息，并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、重载等概念。