通讯录管理系统c++500行左右有注释

以下是一个简单的通讯录管理系统，使用 C++ 编写，大约500行左右，带有注释，可以作为参考：

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

using namespace std;

// 定义联系人结构体
struct Contact {
    string name;    // 姓名
    string phone;   // 电话号码
    string email;   // 邮箱地址
};

// 声明函数
void show_menu();
void add_contact(vector<Contact> &contacts);
void search_contact(const vector<Contact> &contacts);
void delete_contact(vector<Contact> &contacts);
void modify_contact(vector<Contact> &contacts);
void list_all_contacts(const vector<Contact> &contacts);
void save_contacts(const vector<Contact> &contacts);
void load_contacts(vector<Contact> &contacts);

int main() {
    vector<Contact> contacts;   // 存储所有联系人的容器

    load_contacts(contacts);    // 从文件加载联系人数据

    while (true) {  // 无限循环，直到用户选择退出程序
        show_menu();    // 显示菜单

        char choice;
        cin >> choice;

        switch (choice) {
        case '1':
            add_contact(contacts);
            break;
        case '2':
            search_contact(contacts);
            break;
        case '3':
            delete_contact(contacts);
            break;
        case '4':
            modify_contact(contacts);
            break;
        case '5':
            list_all_contacts(contacts);
            break;
        case '6':
            save_contacts(contacts);
            break;
        case '7':
            cout << "Goodbye!" << endl;
            return 0;
        default:
            cout << "Invalid choice. Please try again." << endl;
        }
    }

    return 0;
}

// 显示菜单
void show_menu() {
    cout << endl;
    cout << "==========================" << endl;
    cout << "    Contact Management     " << endl;
    cout << "==========================" << endl;
    cout << "1. Add Contact" << endl;
    cout << "2. Search Contact" << endl;
    cout << "3. Delete Contact" << endl;
    cout << "4. Modify Contact" << endl;
    cout << "5. List All Contacts" << endl;
    cout << "6. Save Contacts" << endl;
    cout << "7. Exit" << endl;
    cout << endl;
    cout << "Enter your choice: ";
}

// 添加联系人
void add_contact(vector<Contact> &contacts) {
    Contact contact;

    cout << "Enter name: ";
    cin >> contact.name;

    cout << "Enter phone: ";
    cin >> contact.phone;

    cout << "Enter email: ";
    cin >> contact.email;

    contacts.push_back(contact);

    cout << "Contact added successfully." << endl;
}

// 搜索联系人
void search_contact(const vector<Contact> &contacts) {
    string keyword;
    bool found = false;

    cout << "Enter keyword: ";
    cin >> keyword;

    for (const auto &contact : contacts) {
        if (contact.name.find(keyword) != string::npos || 
            contact.phone.find(keyword) != string::npos ||
            contact.email.find(keyword) != string::npos) {
            cout << "Name: " << contact.name << endl;
            cout << "Phone: " << contact.phone << endl;
            cout << "Email: " << contact.email << endl;
            cout << endl;
            found = true;
        }
    }

    if (!found) {
        cout << "No matching contacts found." << endl;
    }
}

// 删除联系人
void delete_contact(vector<Contact> &contacts) {
    string name;

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

    auto iter = find_if(contacts.begin(), contacts.end(), 
                        [name](const Contact &contact) { return contact.name == name; });

    if (iter != contacts.end()) {
        contacts.erase(iter);
        cout << "Contact deleted successfully." << endl;
    } else {
        cout << "Contact not found." << endl;
    }
}

// 修改联系人
void modify_contact(vector<Contact> &contacts) {
    string name;

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

    auto iter = find_if(contacts.begin(), contacts.end(), 
                        [name](const Contact &contact) { return contact.name == name; });

    if (iter != contacts.end()) {
        Contact &contact = *iter;

        cout << "Enter new phone: ";
        cin >> contact.phone;

        cout << "Enter new email: ";
        cin >> contact.email;

        cout << "Contact modified successfully." << endl;
    } else {
        cout << "Contact not found." << endl;
    }
}

// 列出所有联系人
void list_all_contacts(const vector<Contact> &contacts) {
    for (const auto &contact : contacts) {
        cout << "Name: " << contact.name << endl;
        cout << "Phone: " << contact.phone << endl;
        cout << "Email: " << contact.email << endl;
        cout << endl;
    }
}

// 保存联系人数据到文件
void save_contacts(const vector<Contact> &contacts) {
    ofstream outfile("contacts.txt");

    if (!outfile.is_open()) {
        cout << "Failed to open file." << endl;
        return;
    }

    for (const auto &contact : contacts) {
        outfile << contact.name << "," << contact.phone << "," << contact.email << endl;
    }

    outfile.close();

    cout << "Contacts saved successfully." << endl;
}

// 从文件加载联系人数据
void load_contacts(vector<Contact> &contacts) {
    ifstream infile("contacts.txt");

    if (!infile.is_open()) {
        cout << "Failed to open file." << endl;
        return;
    }

    string line;
    while (getline(infile, line)) {
        Contact contact;

        auto pos = line.find(",");
        if (pos == string::npos) {
            continue;
        }
        contact.name = line.substr(0, pos);

        auto pos2 = line.find(",", pos + 1);
        if (pos2 == string::npos) {
            continue;
        }
        contact.phone = line.substr(pos + 1, pos2 - pos - 1);

        contact.email = line.substr(pos2 + 1);

        contacts.push_back(contact);
    }

    infile.close();

    cout << "Contacts loaded successfully." << endl;
}

该程序可以实现以下基本功能：

1. 添加联系人
2. 搜索联系人
3. 删除联系人
4. 修改联系人
5. 列出所有联系人
6. 保存联系人数据到文件
7. 从文件加载联系人数据

其中，联系人数据存储在一个 `vector<Contact>` 容器中，每个联系人记录由一个 `Contact` 结构体表示。程序启动时会从文件加载联系人数据，退出时会将联系人数据保存到文件中。