1）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，使用数组，用CArray类实现， （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。 （5）建立一个C++工程，包含需要的.h和.cpp文件

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1）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。

#include <iostream>
#include <string>
using namespace std;

class Contact {
private:
    string name;
    string tel;
    string postcode;

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

    string getName() {
        return name;
    }

    string getTel() {
        return tel;
    }

    string getPostcode() {
        return postcode;
    }

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

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

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

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

（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，使用数组，用CArray类实现，

#include <iostream>
#include <string>
#include "CArray.h"
#include "Contact.h"
using namespace std;

class AddressBook {
private:
    CArray<Contact*> contacts;

public:
    void displayAllContacts() {
        for (int i = 0; i < contacts.getSize(); i++) {
            contacts[i]->display();
            cout << endl;
        }
    }

    void addContact(Contact* contact) {
        contacts.append(contact);
    }

    void deleteContact(int index) {
        contacts.removeAt(index);
    }

    void insertContact(int index, Contact* contact) {
        contacts.insertAt(index, contact);
    }

    Contact* findContact(string name) {
        for (int i = 0; i < contacts.getSize(); i++) {
            if (contacts[i]->getName() == name) {
                return contacts[i];
            }
        }
        return NULL;
    }

    void saveToFile(string filename) {
        ofstream fout(filename);
        for (int i = 0; i < contacts.getSize(); i++) {
            fout << contacts[i]->getName() << "," << contacts[i]->getTel() << "," << contacts[i]->getPostcode() << endl;
        }
        fout.close();
    }

    void loadFromFile(string filename) {
        ifstream fin(filename);
        string line;
        while (getline(fin, line)) {
            int pos1 = line.find(",");
            int pos2 = line.find(",", pos1 + 1);
            string name = line.substr(0, pos1);
            string tel = line.substr(pos1 + 1, pos2 - pos1 - 1);
            string postcode = line.substr(pos2 + 1);
            Contact* contact = new Contact(name, tel, postcode);
            contacts.append(contact);
        }
        fin.close();
    }
};

（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。

#include <iostream>
#include <string>
#include "AddressBook.h"
using namespace std;

int main() {
    AddressBook addressBook;
    int choice;
    string name, tel, postcode;
    while (true) {
        cout << "1. Display all contacts" << endl;
        cout << "2. Add a contact" << endl;
        cout << "3. Delete a contact" << endl;
        cout << "4. Insert a contact" << endl;
        cout << "5. Find a contact" << endl;
        cout << "6. Save to file" << endl;
        cout << "7. Load from file" << endl;
        cout << "8. Exit" << endl;
        cout << "Enter your choice: ";
        cin >> choice;
        switch (choice) {
        case 1:
            addressBook.displayAllContacts();
            break;
        case 2:
            cout << "Enter name: ";
            cin >> name;
            cout << "Enter tel: ";
            cin >> tel;
            cout << "Enter postcode: ";
            cin >> postcode;
            addressBook.addContact(new Contact(name, tel, postcode));
            break;
        case 3:
            int index;
            cout << "Enter index: ";
            cin >> index;
            addressBook.deleteContact(index);
            break;
        case 4:
            int index2;
            cout << "Enter index: ";
            cin >> index2;
            cout << "Enter name: ";
            cin >> name;
            cout << "Enter tel: ";
            cin >> tel;
            cout << "Enter postcode: ";
            cin >> postcode;
            addressBook.insertContact(index2, new Contact(name, tel, postcode));
            break;
        case 5:
            cout << "Enter name: ";
            cin >> name;
            Contact* contact = addressBook.findContact(name);
            if (contact == NULL) {
                cout << "Contact not found" << endl;
            }
            else {
                contact->display();
            }
            break;
        case 6:
            string filename;
            cout << "Enter filename: ";
            cin >> filename;
            addressBook.saveToFile(filename);
            break;
        case 7:
            string filename2;
            cout << "Enter filename: ";
            cin >> filename2;
            addressBook.loadFromFile(filename2);
            break;
        case 8:
            return 0;
        default:
            cout << "Invalid choice" << endl;
        }
    }
}

（5）建立一个C 工程，包含需要的.h和.cpp文件

请根据您的实际情况自行创建工程，并将上述代码分别保存为.h和.cpp文件。