能用C++写小型通讯录设计吗

当然可以用C++来实现一个小型通讯录设计。以下是一个简单的示例代码：

#include <iostream>
#include <string>
#include <vector>

using namespace std;

struct Contact {
    string name;
    string phone;
    string email;
};

int main() {
    vector<Contact> contacts;
    int choice;
    cout << "Welcome to the contact book!" << endl;
    while (true) {
        cout << "Please select an option:" << endl;
        cout << "1. Add a contact" << endl;
        cout << "2. List all contacts" << endl;
        cout << "3. Quit" << endl;
        cin >> choice;
        if (choice == 1) {
            Contact contact;
            cout << "Enter the name: ";
            cin >> contact.name;
            cout << "Enter the phone number: ";
            cin >> contact.phone;
            cout << "Enter the email address: ";
            cin >> contact.email;
            contacts.push_back(contact);
            cout << "Contact added successfully!" << endl;
        } else if (choice == 2) {
            if (contacts.empty()) {
                cout << "No contacts found." << endl;
            } else {
                cout << "Contacts:" << endl;
                for (const auto& contact : contacts) {
                    cout << "Name: " << contact.name << endl;
                    cout << "Phone: " << contact.phone << endl;
                    cout << "Email: " << contact.email << endl;
                    cout << endl;
                }
            }
        } else if (choice == 3) {
            cout << "Goodbye!" << endl;
            break;
        } else {
            cout << "Invalid choice! Please try again." << endl;
        }
    }
    return 0;
}

这个程序使用了结构体来表示一个联系人的信息，使用了vector来存储所有的联系人。程序提供了三个选项：添加联系人、列出所有联系人和退出程序。用户可以根据自己的需要进行操作。