c++编程设计并实现一个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（可以用实验5中的CArray类实现，也可以用STL的容器实现）。（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.禁止使用vector

以下是实现联系人类和通讯录类的代码示例：

#include <iostream>
#include <fstream>
#include <string>
#include <cstring>
#include <cstdlib>
#include <cstdio>

using namespace std;

const int MAX_NAME_LEN = 20;
const int MAX_TEL_LEN = 15;
const int MAX_POSTCODE_LEN = 10;
const int MAX_CONTACTS_NUM = 100;

class Contact {
private:
    char name[MAX_NAME_LEN];
    char tel[MAX_TEL_LEN];
    char postcode[MAX_POSTCODE_LEN];
public:
    Contact(const char* n, const char* t, const char* p) {
        strncpy(name, n, MAX_NAME_LEN);
        strncpy(tel, t, MAX_TEL_LEN);
        strncpy(postcode, p, MAX_POSTCODE_LEN);
    }
    const char* getName() const {
        return name;
    }
    const char* getTel() const {
        return tel;
    }
    const char* getPostcode() const {
        return postcode;
    }
    void setName(const char* n) {
        strncpy(name, n, MAX_NAME_LEN);
    }
    void setTel(const char* t) {
        strncpy(tel, t, MAX_TEL_LEN);
    }
    void setPostcode(const char* p) {
        strncpy(postcode, p, MAX_POSTCODE_LEN);
    }
    void display() const {
        cout << "Name: " << name << endl;
        cout << "Tel: " << tel << endl;
        cout << "Postcode: " << postcode << endl;
    }
};

class AddressBook {
private:
    Contact* contacts[MAX_CONTACTS_NUM];
    int numContacts;
public:
    AddressBook() {
        numContacts = 0;
        for (int i = 0; i < MAX_CONTACTS_NUM; i++) {
            contacts[i] = NULL;
        }
    }
    ~AddressBook() {
        for (int i = 0; i < numContacts; i++) {
            delete contacts[i];
        }
    }
    void addContact(Contact* c) {
        if (numContacts < MAX_CONTACTS_NUM) {
            contacts[numContacts++] = c;
        }
    }
    void deleteContact(int index) {
        if (index >= 0 && index < numContacts) {
            delete contacts[index];
            for (int i = index; i < numContacts - 1; i++) {
                contacts[i] = contacts[i + 1];
            }
            contacts[--numContacts] = NULL;
        }
    }
    void insertContact(int index, Contact* c) {
        if (index >= 0 && index < numContacts && numContacts < MAX_CONTACTS_NUM) {
            for (int i = numContacts; i > index; i--) {
                contacts[i] = contacts[i - 1];
            }
            contacts[index] = c;
            numContacts++;
        }
    }
    Contact* findContact(const char* name) const {
        for (int i = 0; i < numContacts; i++) {
            if (strcmp(contacts[i]->getName(), name) == 0) {
                return contacts[i];
            }
        }
        return NULL;
    }
    void displayAllContacts() const {
        for (int i = 0; i < numContacts; i++) {
            contacts[i]->display();
            cout << endl;
        }
    }
    void saveToFile(const char* filename) const {
        ofstream fout(filename);
        if (fout.is_open()) {
            fout << numContacts << endl;
            for (int i = 0; i < numContacts; i++) {
                fout << contacts[i]->getName() << endl;
                fout << contacts[i]->getTel() << endl;
                fout << contacts[i]->getPostcode() << endl;
            }
            fout.close();
        }
    }
    void loadFromFile(const char* filename) {
        ifstream fin(filename);
        if (fin.is_open()) {
            int n;
            fin >> n;
            fin.ignore();
            for (int i = 0; i < n; i++) {
                char name[MAX_NAME_LEN];
                char tel[MAX_TEL_LEN];
                char postcode[MAX_POSTCODE_LEN];
                fin.getline(name, MAX_NAME_LEN);
                fin.getline(tel, MAX_TEL_LEN);
                fin.getline(postcode, MAX_POSTCODE_LEN);
                Contact* c = new Contact(name, tel, postcode);
                addContact(c);
            }
            fin.close();
        }
    }
};

int main() {
    AddressBook book;
    int choice;
    do {
        cout << "1. Display all contacts" << endl;
        cout << "2. Add a contact" << endl;
        cout << "3. Find a contact" << endl;
        cout << "4. Delete a contact" << endl;
        cout << "5. Save to file" << endl;
        cout << "6. Load from file" << endl;
        cout << "0. Exit" << endl;
        cout << "Enter your choice: ";
        cin >> choice;
        switch (choice) {
        case 1:
            book.displayAllContacts();
            break;
        case 2:
            char name[MAX_NAME_LEN];
            char tel[MAX_TEL_LEN];
            char postcode[MAX_POSTCODE_LEN];
            cout << "Enter name: ";
            cin.ignore();
            cin.getline(name, MAX_NAME_LEN);
            cout << "Enter tel: ";
            cin.getline(tel, MAX_TEL_LEN);
            cout << "Enter postcode: ";
            cin.getline(postcode, MAX_POSTCODE_LEN);
            Contact* c = new Contact(name, tel, postcode);
            book.addContact(c);
            break;
        case 3:
            char searchName[MAX_NAME_LEN];
            cout << "Enter name to search: ";
            cin.ignore();
            cin.getline(searchName, MAX_NAME_LEN);
            Contact* result = book.findContact(searchName);
            if (result != NULL) {
                result->display();
            }
            else {
                cout << "Contact not found." << endl;
            }
            break;
        case 4:
            int index;
            cout << "Enter index to delete: ";
            cin >> index;
            book.deleteContact(index);
            break;
        case 5:
            char filename[100];
            cout << "Enter filename to save: ";
            cin.ignore();
            cin.getline(filename, 100);
            book.saveToFile(filename);
            break;
        case 6:
            char loadFilename[100];
            cout << "Enter filename to load: ";
            cin.ignore();
            cin.getline(loadFilename, 100);
            book.loadFromFile(loadFilename);
            break;
        case 0:
            break;
        default:
            cout << "Invalid choice." << endl;
            break;
        }
    } while (choice != 0);
    return 0;
}

这个程序实现了一个简单的通讯录，可以添加、删除、查找、显示所有联系人，并支持将联系人保存到文件和从文件中读取联系人。注意，这个程序使用了动态内存分配，需要在析构函数中释放内存。