How to write a simple address book program in C++?

struct AddressBookEntry {
    std::string name;
    std::string phoneNumber;
    std::string address;
};

#include <iostream>
#include <vector>

std::vector<AddressBookEntry> addressBook; // 存储地址簿条目的全局变量

// 添加新条目
void addEntry() {
    AddressBookEntry entry;
    std::cout << "请输入姓名：";
    std::getline(std::cin, entry.name);
    std::cout << "请输入电话号码：";
    std::getline(std::cin, entry.phoneNumber);
    std::cout << "请输入地址：";
    std::getline(std::cin, entry.address);
    addressBook.push_back(entry);
    std::cout << "新增条目成功！
";
}

// 查找条目
void findEntry() {
    std::string name;
    std::cout << "请输入要查找的姓名：";
    std::getline(std::cin, name);
    for (const auto& entry : addressBook) {
        if (entry.name == name) {
            std::cout << "姓名：" << entry.name << "
";
            std::cout << "电话号码：" << entry.phoneNumber << "
";
            std::cout << "地址：" << entry.address << "
";
            return;
        }
    }
    std::cout << "未找到匹配的条目。
";
}

// 更新条目
void updateEntry() {
    std::string name;
    std::cout << "请输入要更新的姓名：";
    std::getline(std::cin, name);
    for (auto& entry : addressBook) {
        if (entry.name == name) {
            std::cout << "请输入新的电话号码：";
            std::getline(std::cin, entry.phoneNumber);
            std::cout << "请输入新的地址：";
            std::getline(std::cin, entry.address);
            std::cout << "更新条目成功！
";
            return;
        }
    }
    std::cout << "未找到匹配的条目。
";
}

// 删除条目
void deleteEntry() {
    std::string name;
    std::cout << "请输入要删除的姓名：";
    std::getline(std::cin, name);
    for (auto it = addressBook.begin(); it != addressBook.end(); ++it) {
        if (it->name == name) {
            addressBook.erase(it);
            std::cout << "删除条目成功！
";
            return;
        }
    }
    std::cout << "未找到匹配的条目。
";
}

// 显示地址簿
void displayAddressBook() {
    if (addressBook.empty()) {
        std::cout << "地址簿为空。
";
        return;
    }
    for (const auto& entry : addressBook) {
        std::cout << "姓名：" << entry.name << "
";
        std::cout << "电话号码：" << entry.phoneNumber << "
";
        std::cout << "地址：" << entry.address << "
";
    }
}

// 主菜单
void mainMenu() {
    std::cout << "1. 添加新条目
";
    std::cout << "2. 查找条目
";
    std::cout << "3. 更新条目
";
    std::cout << "4. 删除条目
";
    std::cout << "5. 显示地址簿
";
    std::cout << "0. 退出程序
";
    std::cout << "请选择操作：";
}

int main() {
    int choice;
    
    do {
        mainMenu();
        std::cin >> choice;
        std::cin.ignore(); // 忽略输入缓冲区中的换行符
        std::cout << "
";
        
        switch (choice) {
            case 1:
                addEntry();
                break;
            case 2:
                findEntry();
                break;
            case 3:
                updateEntry();
                break;
            case 4:
                deleteEntry();
                break;
            case 5:
                displayAddressBook();
                break;
            case 0:
                std::cout << "退出程序。
";
                break;
            default:
                std::cout << "无效的选择。
";
                break;
        }
        
        std::cout << "
";
    } while (choice != 0);
    
    return 0;
}