怎么用C++写一个通讯录系统

以下是一个简单的通讯录系统的C++代码，它可以添加、查找、修改和删除联系人：

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

using namespace std;

struct Contact
{
    string name;
    string phone;
};

vector<Contact> contact_list;

void add_contact()
{
    Contact c;
    cout << "Enter name: ";
    cin >> c.name;
    cout << "Enter phone number: ";
    cin >> c.phone;
    contact_list.push_back(c);
    cout << "Contact added successfully!" << endl;
}

void search_contact()
{
    string name;
    cout << "Enter name to search: ";
    cin >> name;
    for (int i = 0; i < contact_list.size(); i++)
    {
        if (contact_list[i].name == name)
        {
            cout << "Phone number for " << name << " is " << contact_list[i].phone << endl;
            return;
        }
    }
    cout << "Contact not found!" << endl;
}

void modify_contact()
{
    string name;
    cout << "Enter name to modify: ";
    cin >> name;
    for (int i = 0; i < contact_list.size(); i++)
    {
        if (contact_list[i].name == name)
        {
            cout << "Enter new phone number: ";
            cin >> contact_list[i].phone;
            cout << "Contact modified successfully!" << endl;
            return;
        }
    }
    cout << "Contact not found!" << endl;
}

void delete_contact()
{
    string name;
    cout << "Enter name to delete: ";
    cin >> name;
    for (int i = 0; i < contact_list.size(); i++)
    {
        if (contact_list[i].name == name)
        {
            contact_list.erase(contact_list.begin() + i);
            cout << "Contact deleted successfully!" << endl;
            return;
        }
    }
    cout << "Contact not found!" << endl;
}

int main()
{
    int choice;
    while (true)
    {
        cout << endl << "Select an option:" << endl;
        cout << "1. Add contact" << endl;
        cout << "2. Search contact" << endl;
        cout << "3. Modify contact" << endl;
        cout << "4. Delete contact" << endl;
        cout << "5. Exit" << endl;
        cin >> choice;
        switch (choice)
        {
        case 1:
            add_contact();
            break;
        case 2:
            search_contact();
            break;
        case 3:
            modify_contact();
            break;
        case 4:
            delete_contact();
            break;
        case 5:
            return 0;
        default:
            cout << "Invalid choice!" << endl;
            break;
        }
    }
}

在此示例中，我们使用一个结构体来表示联系人，并使用一个动态数组（vector）来保存联系人列表。通过使用循环和条件语句，我们可以在不同的选项中实现各种操作。

请注意，此代码仅供参考。如果您需要一个更复杂的通讯录系统，您可能需要更多的功能和错误处理。