写c++程序：设计一个通讯录系统，联系人基本信息包括：联系人姓名、手机号码、邮 箱、工作单位、家庭住址等基本信息，完成下面的功能需求，根据功能需求选 择合适的逻辑结构和存储结构。 二、功能需求 （1）增加功能：能添加新的联系人信息。 （2）删除功能：能够删除通讯录中的联系人。 （3）修改功能：能够对通讯录中的联系人信息进行修改。 （4）查询功能：通过员工号查询员工信息，并显示该员工所有信息。 （5）排序功能：可以对联系人信息排序，对联系人姓名按照字典序排序， 之后显示排序后的通讯录所有联系人信息。 （6）显示功能：显示通讯录中所有联系人信息。 另一功能：能够从文本中读取联系人信息，对联系人信息更改之后可以将 通讯录中联系人信息保存到文本中，方便下次读取。

好的，以下是一个简单的通讯录系统的C++代码，实现了您所需的所有功能：

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

using namespace std;

// 节点结构体
struct ContactNode {
    string name;
    string phone;
    string email;
    string company;
    string address;
    ContactNode* next;
};

// 链表类
class ContactList {
public:
    // 构造函数
    ContactList() {
        head = nullptr;
    }

    // 析构函数
    ~ContactList() {
        ContactNode* current = head;
        while (current != nullptr) {
            ContactNode* temp = current;
            current = current->next;
            delete temp;
        }
    }

    // 增加联系人
    void addContact() {
        ContactNode* newContact = new ContactNode;
        cout << "请输入联系人姓名：";
        cin >> newContact->name;
        cout << "请输入联系人手机号码：";
        cin >> newContact->phone;
        cout << "请输入联系人邮箱：";
        cin >> newContact->email;
        cout << "请输入联系人工作单位：";
        cin >> newContact->company;
        cout << "请输入联系人家庭住址：";
        cin >> newContact->address;

        newContact->next = head;
        head = newContact;

        cout << "联系人添加成功！" << endl;
    }

    // 删除联系人
    void deleteContact() {
        string name;
        cout << "请输入要删除的联系人姓名：";
        cin >> name;

        ContactNode* current = head;
        ContactNode* prev = nullptr;

        while (current != nullptr) {
            if (current->name == name) {
                if (prev == nullptr) {
                    head = current->next;
                } else {
                    prev->next = current->next;
                }
                delete current;
                cout << "联系人删除成功！" << endl;
                return;
            } else {
                prev = current;
                current = current->next;
            }
        }

        cout << "找不到要删除的联系人！" << endl;
    }

    // 修改联系人
    void modifyContact() {
        string name;
        cout << "请输入要修改的联系人姓名：";
        cin >> name;

        ContactNode* current = head;

        while (current != nullptr) {
            if (current->name == name) {
                cout << "请输入联系人手机号码：";
                cin >> current->phone;
                cout << "请输入联系人邮箱：";
                cin >> current->email;
                cout << "请输入联系人工作单位：";
                cin >> current->company;
                cout << "请输入联系人家庭住址：";
                cin >> current->address;
                cout << "联系人修改成功！" << endl;
                return;
            } else {
                current = current->next;
            }
        }

        cout << "找不到要修改的联系人！" << endl;
    }

    // 查询联系人
    void searchContact() {
        string name;
        cout << "请输入要查询的联系人姓名：";
        cin >> name;

        ContactNode* current = head;

        while (current != nullptr) {
            if (current->name == name) {
                cout << "姓名：" << current->name << endl;
                cout << "手机号码：" << current->phone << endl;
                cout << "邮箱：" << current->email << endl;
                cout << "工作单位：" << current->company << endl;
                cout << "家庭住址：" << current->address << endl;
                return;
            } else {
                current = current->next;
            }
        }

        cout << "找不到要查询的联系人！" << endl;
    }

    // 排序联系人
    void sortContact() {
        int size = 0;
        ContactNode* current = head;

        while (current != nullptr) {
            size++;
            current = current->next;
        }

        ContactNode** arr = new ContactNode*[size];
        current = head;

        for (int i = 0; i < size; i++) {
            arr[i] = current;
            current = current->next;
        }

        for (int i = 0; i < size - 1; i++) {
            for (int j = 0; j < size - i - 1; j++) {
                if (arr[j]->name > arr[j + 1]->name) {
                    swap(arr[j], arr[j + 1]);
                }
            }
        }

        head = arr[0];
        current = head;

        for (int i = 1; i < size; i++) {
            current->next = arr[i];
            current = current->next;
        }

        current->next = nullptr;

        cout << "联系人排序成功！" << endl;
    }

    // 显示所有联系人
    void displayAll() {
        ContactNode* current = head;

        while (current != nullptr) {
            cout << "姓名：" << current->name << endl;
            cout << "手机号码：" << current->phone << endl;
            cout << "邮箱：" << current->email << endl;
            cout << "工作单位：" << current->company << endl;
            cout << "家庭住址：" << current->address << endl << endl;
            current = current->next;
        }
    }

    // 从文件中读取联系人信息
    void readFromFile() {
        ifstream infile("contacts.txt");

        if (!infile.is_open()) {
            cout << "无法打开文件！" << endl;
            return;
        }

        string name, phone, email, company, address;

        while (infile >> name >> phone >> email >> company >> address) {
            ContactNode* newContact = new ContactNode;
            newContact->name = name;
            newContact->phone = phone;
            newContact->email = email;
            newContact->company = company;
            newContact->address = address;
            newContact->next = head;
            head = newContact;
        }

        infile.close();
        cout << "联系人信息读取成功！" << endl;
    }

    // 将联系人信息保存到文件中
    void writeToFile() {
        ofstream outfile("contacts.txt");

        if (!outfile.is_open()) {
            cout << "无法打开文件！" << endl;
            return;
        }

        ContactNode* current = head;

        while (current != nullptr) {
            outfile << current->name << " " << current->phone << " " << current->email << " " << current->company << " " << current->address << endl;
            current = current->next;
        }

        outfile.close();
        cout << "联系人信息保存成功！" << endl;
    }

private:
    ContactNode* head;
};

// 主函数
int main() {
    ContactList contacts;

    cout << "欢迎使用通讯录系统！" << endl;
    contacts.readFromFile();

    while (true) {
        cout << endl;
        cout << "请选择要进行的操作：" << endl;
        cout << "1. 增加联系人" << endl;
        cout << "2. 删除联系人" << endl;
        cout << "3. 修改联系人" << endl;
        cout << "4. 查询联系人" << endl;
        cout << "5. 排序联系人" << endl;
        cout << "6. 显示所有联系人" << endl;
        cout << "7. 保存联系人信息到文件" << endl;
        cout << "8. 退出通讯录系统" << endl;
        int choice;
        cin >> choice;

        switch (choice) {
            case 1:
                contacts.addContact();
                break;
            case 2:
                contacts.deleteContact();
                break;
            case 3:
                contacts.modifyContact();
                break;
            case 4:
                contacts.searchContact();
                break;
            case 5:
                contacts.sortContact();
                break;
            case 6:
                contacts.displayAll();
                break;
            case 7:
                contacts.writeToFile();
                break;
            case 8:
                contacts.writeToFile();
                cout << "感谢使用通讯录系统！" << endl;
                return 0;
            default:
                cout << "无效的选项！" << endl;
                break;
        }
    }
}

注意，在运行程序之前，需要先创建一个名为 "contacts.txt" 的文本文件，用于存储联系人信息。另外，以上代码只是一个简单的实现，您可以根据需要进行修改和完善。