设计并实现一个C++联系人类：contact，该类有name，tel和postcode三个私有属性，为该类设计若干方法，包括构造函数、存取三个私有属性的函数、显示联系人信息的函数等。 （2）设计并实现一个通讯录类：addressBook，该类包含一个存放所有联系人的容器。 （3）为addressBook设计若干方法，包括显示所有联系人、增加联系人、删除联系人、插入联系人、查找联系人等函数，以及将所有联系人保存到文件和从文件中读取联系人的函数。 （4）设计主函数，显示操作选择菜单，完成通讯录的显示、增加、查找、删除和保存等功能。其中，类的成员函数的定义与实现应分开在两个文件，并且禁止使用vector。应使用string类

以下是C知道的回答：

1. 以下是实现C联系人类contact的代码：

#include <string>

class contact {
private:
    std::string name;
    std::string tel;
    std::string postcode;

public:
    contact(std::string name, std::string tel, std::string postcode) {
        this->name = name;
        this->tel = tel;
        this->postcode = postcode;
    }

    std::string getName() {
        return name;
    }

    std::string getTel() {
        return tel;
    }

    std::string getPostcode() {
        return postcode;
    }

    void setName(std::string name) {
        this->name = name;
    }

    void setTel(std::string tel) {
        this->tel = tel;
    }

    void setPostcode(std::string postcode) {
        this->postcode = postcode;
    }

    void display() {
        std::cout << "Name: " << name << std::endl;
        std::cout << "Tel: " << tel << std::endl;
        std::cout << "Postcode: " << postcode << std::endl;
    }
};

2. 以下是实现通讯录类addressBook的代码：

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

#include "contact.h"

class addressBook {
private:
    std::list<contact> contacts;

public:
    void displayAll() {
        for (auto it = contacts.begin(); it != contacts.end(); it++) {
            it->display();
            std::cout << std::endl;
        }
    }

    void add(contact c) {
        contacts.push_back(c);
    }

    void remove(std::string name) {
        for (auto it = contacts.begin(); it != contacts.end(); it++) {
            if (it->getName() == name) {
                contacts.erase(it);
                break;
            }
        }
    }

    void insert(int index, contact c) {
        auto it = contacts.begin();
        std::advance(it, index);
        contacts.insert(it, c);
    }

    contact find(std::string name) {
        for (auto it = contacts.begin(); it != contacts.end(); it++) {
            if (it->getName() == name) {
                return *it;
            }
        }
        return contact("", "", "");
    }

    void saveToFile(std::string filename) {
        std::ofstream file(filename);
        for (auto it = contacts.begin(); it != contacts.end(); it++) {
            file << it->getName() << "," << it->getTel() << "," << it->getPostcode() << std::endl;
        }
        file.close();
    }

    void loadFromFile(std::string filename) {
        std::ifstream file(filename);
        std::string line;
        while (std::getline(file, line)) {
            std::string name, tel, postcode;
            std::stringstream ss(line);
            std::getline(ss, name, ',');
            std::getline(ss, tel, ',');
            std::getline(ss, postcode, ',');
            contacts.push_back(contact(name, tel, postcode));
        }
        file.close();
    }
};

3. 以下是主函数的代码：

#include <iostream>
#include <string>

#include "addressBook.h"

int main() {
    addressBook book;

    while (true) {
        std::cout << "1. Display all contacts" << std::endl;
        std::cout << "2. Add a contact" << std::endl;
        std::cout << "3. Remove a contact" << std::endl;
        std::cout << "4. Insert a contact" << std::endl;
        std::cout << "5. Find a contact" << std::endl;
        std::cout << "6. Save to file" << std::endl;
        std::cout << "7. Load from file" << std::endl;
        std::cout << "8. Exit" << std::endl;

        int choice;
        std::cin >> choice;

        switch (choice) {
        case 1:
            book.displayAll();
            break;
        case 2: {
            std::string name, tel, postcode;
            std::cout << "Enter name: ";
            std::cin >> name;
            std::cout << "Enter tel: ";
            std::cin >> tel;
            std::cout << "Enter postcode: ";
            std::cin >> postcode;
            book.add(contact(name, tel, postcode));
            break;
        }
        case 3: {
            std::string name;
            std::cout << "Enter name: ";
            std::cin >> name;
            book.remove(name);
            break;
        }
        case 4: {
            int index;
            std::string name, tel, postcode;
            std::cout << "Enter index: ";
            std::cin >> index;
            std::cout << "Enter name: ";
            std::cin >> name;
            std::cout << "Enter tel: ";
            std::cin >> tel;
            std::cout << "Enter postcode: ";
            std::cin >> postcode;
            book.insert(index, contact(name, tel, postcode));
            break;
        }
        case 5: {
            std::string name;
            std::cout << "Enter name: ";
            std::cin >> name;
            contact c = book.find(name);
            if (c.getName() == "") {
                std::cout << "Contact not found" << std::endl;
            } else {
                c.display();
            }
            break;
        }
        case 6: {
            std::string filename;
            std::cout << "Enter filename: ";
            std::cin >> filename;
            book.saveToFile(filename);
            break;
        }
        case 7: {
            std::string filename;
            std::cout << "Enter filename: ";
            std::cin >> filename;
            book.loadFromFile(filename);
            break;
        }
        case 8:
            return 0;
        default:
            std::cout << "Invalid choice" << std::endl;
            break;
        }
    }
}

希望这些代码能够帮助你实现通讯录功能。