用c++写一段关于仓库管理系统的代码，要求：仓库中货物信息包括：货物编号、货物名称、货物单价、货物数量等。 功能要求： 1） 增加和删除货物信息 2） 按编号或名称查询货物信息 3） 显示库存量不足一定值（由用户输入）的货物信息 4） 显示所有货物的信息 5） 对所有货物信息读写文

好的，以下是一份 C++ 代码，实现了基本的仓库管理系统功能，可以满足您的需求。注意，该代码只是一个简单的示例，并未进行完整的测试和优化，请谨慎使用。

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

using namespace std;

// 声明货物类
class Goods {
public:
    Goods(string id, string name, double price, int quantity) {
        m_id = id;
        m_name = name;
        m_price = price;
        m_quantity = quantity;
    }
    string get_id() {
        return m_id;
    }
    string get_name() {
        return m_name;
    }
    double get_price() {
        return m_price;
    }
    int get_quantity() {
        return m_quantity;
    }
    void set_id(string id) {
        m_id = id;
    }
    void set_name(string name) {
        m_name = name;
    }
    void set_price(double price) {
        m_price = price;
    }
    void set_quantity(int quantity) {
        m_quantity = quantity;
    }
private:
    string m_id;
    string m_name;
    double m_price;
    int m_quantity;
};

// 声明仓库类
class Warehouse {
public:
    Warehouse() {
        // 从文件中读取货物信息
        ifstream infile("goods.txt");
        string id, name;
        double price;
        int quantity;
        while (infile >> id >> name >> price >> quantity) {
            Goods goods(id, name, price, quantity);
            m_goods.push_back(goods);
        }
        infile.close();
    }
    // 添加货物
    void add_goods(Goods goods) {
        m_goods.push_back(goods);
    }
    // 删除货物
    void delete_goods(string id) {
        for (vector<Goods>::iterator it = m_goods.begin(); it != m_goods.end(); it++) {
            if (it->get_id() == id) {
                m_goods.erase(it);
                break;
            }
        }
    }
    // 按编号查询货物
    Goods* search_goods_by_id(string id) {
        for (vector<Goods>::iterator it = m_goods.begin(); it != m_goods.end(); it++) {
            if (it->get_id() == id) {
                return &(*it);
            }
        }
        return NULL;
    }
    // 按名称查询货物
    vector<Goods*> search_goods_by_name(string name) {
        vector<Goods*> result;
        for (vector<Goods>::iterator it = m_goods.begin(); it != m_goods.end(); it++) {
            if (it->get_name() == name) {
                result.push_back(&(*it));
            }
        }
        return result;
    }
    // 显示库存量不足一定值的货物信息
    vector<Goods*> show_low_quantity_goods(int quantity) {
        vector<Goods*> result;
        for (vector<Goods>::iterator it = m_goods.begin(); it != m_goods.end(); it++) {
            if (it->get_quantity() < quantity) {
                result.push_back(&(*it));
            }
        }
        return result;
    }
    // 显示所有货物信息
    void show_all_goods() {
        for (vector<Goods>::iterator it = m_goods.begin(); it != m_goods.end(); it++) {
            cout << it->get_id() << " " << it->get_name() << " " << it->get_price() << " " << it->get_quantity() << endl;
        }
    }
    // 保存货物信息到文件
    void save_to_file() {
        ofstream outfile("goods.txt");
        for (vector<Goods>::iterator it = m_goods.begin(); it != m_goods.end(); it++) {
            outfile << it->get_id() << " " << it->get_name() << " " << it->get_price() << " " << it->get_quantity() << endl;
        }
        outfile.close();
    }
private:
    vector<Goods> m_goods;
};

// 主函数
int main() {
    Warehouse warehouse;
    int choice;
    while (true) {
        cout << "1.添加货物 2.删除货物 3.按编号查询货物 4.按名称查询货物 5.显示库存量不足的货物 6.显示所有货物 7.保存货物信息到文件 8.退出" << endl;
        cout << "请选择操作：";
        cin >> choice;
        switch (choice) {
        case 1: {
            string id, name;
            double price;
            int quantity;
            cout << "请输入货物编号：";
            cin >> id;
            cout << "请输入货物名称：";
            cin >> name;
            cout << "请输入货物单价：";
            cin >> price;
            cout << "请输入货物数量：";
            cin >> quantity;
            Goods goods(id, name, price, quantity);
            warehouse.add_goods(goods);
            cout << "货物添加成功！" << endl;
            break;
        }
        case 2: {
            string id;
            cout << "请输入货物编号：";
            cin >> id;
            warehouse.delete_goods(id);
            cout << "货物删除成功！" << endl;
            break;
        }
        case 3: {
            string id;
            cout << "请输入货物编号：";
            cin >> id;
            Goods* goods = warehouse.search_goods_by_id(id);
            if (goods == NULL) {
                cout << "找不到指定编号的货物！" << endl;
            }
            else {
                cout << goods->get_id() << " " << goods->get_name() << " " << goods->get_price() << " " << goods->get_quantity() << endl;
            }
            break;
        }
        case 4: {
            string name;
            cout << "请输入货物名称：";
            cin >> name;
            vector<Goods*> result = warehouse.search_goods_by_name(name);
            if (result.size() == 0) {
                cout << "找不到指定名称的货物！" << endl;
            }
            else {
                for (vector<Goods*>::iterator it = result.begin(); it != result.end(); it++) {
                    cout << (*it)->get_id() << " " << (*it)->get_name() << " " << (*it)->get_price() << " " << (*it)->get_quantity() << endl;
                }
            }
            break;
        }
        case 5: {
            int quantity;
            cout << "请输入库存量不足的货物数量：";
            cin >> quantity;
            vector<Goods*> result = warehouse.show_low_quantity_goods(quantity);
            if (result.size() == 0) {
                cout << "没有库存量不足的货物！" << endl;
            }
            else {
                for (vector<Goods*>::iterator it = result.begin(); it != result.end(); it++) {
                    cout << (*it)->get_id() << " " << (*it)->get_name() << " " << (*it)->get_price() << " " << (*it)->get_quantity() << endl;
                }
            }
            break;
        }
        case 6: {
            warehouse.show_all_goods();
            break;
        }
        case 7: {
            warehouse.save_to_file();
            cout << "货物信息保存成功！" << endl;
            break;
        }
        case 8: {
            return 0;
        }
        default: {
            cout << "无效的操作！" << endl;
            break;
        }
        }
    }
    return 0;
}

该代码实现了仓库管理系统的基本功能，包括添加货物、删除货物、按编号或名称查询货物、显示库存量不足一定值的货物信息、显示所有货物信息、对所有货物信息进行读写等操作。