c++课设代码

#include <iostream>
#include <fstream>
#include <string>      //头文件引入
#include <stdio.h>
#include <conio.h>

using namespace std;

class Objects  //大类
{
public:             //公共权限
    Objects()
    {
    }
    char name[20];//名字
    char kind[20];//种类
    char place[10];//生产地
    char brand[10];//品牌
    float stockprice;  //成本价；
    float purchaseprice; //购买价；
    int stockamount;  //存货数量；
    int sellamount; //售货数量；
    int money;  //花费；


    Objects* Next;

    void InputAll()   //打印 名称 种类 进货价 售出价  存货数量  产地 品牌
    {
        InputName();
        InputKind();
        InputOther();
    }

    void InputKind()        //打印种类
    {
        cout << "\t\t请选择种类："; cin >> kind;
    }

    void InputName()        //打印名称
    {
        cout << "\t\t请输入商品的名称：";  cin >> name;
    }

    void InputOther()       //打印  进货价 售出价  存货数量  产地 品牌
    {
        cout << "\t\t请输入进货价："; cin >> stockprice;
        cout << "\t\t请输入售出价："; cin >> purchaseprice;
        cout << "\t\t请输入存货数量："; cin >> stockamount;
        cout << "\t\t请输入商品的产地："; cin >> place;
        cout << "\t\t请输入生产商品牌："; cin >> brand;
        money = 0;
    }

    void Inputstockprice()    //打印进货价
    {
        cout << "\t\t请输入进货价："; cin >> stockprice;
    }
    void Inputpurchaseprice()    //打印售出价
    {
        cout << "\t\t请输入售出价："; cin >> purchaseprice;
    }
    void Inputstockamount() //打印商品数量
    {
        cout << "\t\t请输入剩余商品数量："; cin >> stockamount;
    }

    void InputPlace()   //打印商品产地
    {
        cout << "\t\t请输入商品产地："; cin >> place;
    }

    void Inputbrand()       //打印品牌  
    {
        cout << "\t\t请输入生产商品牌："; cin >> brand;
    }

    void ReadFile(istream& in)    //将东西存入文件
    {
        in >> name >> kind >> stockprice >> purchaseprice >> stockamount >> place >> brand;
    }

    void Show2()            //查询和排序某一个商品时打印内容
    {
        cout << "商品名: " << name << endl << "种类:" << kind << endl << "进货价： " << stockprice << endl << "售出价： " << purchaseprice << endl << "剩余商品数量: " <<
            stockamount << endl << "商品的产地: " << place << endl << "生产商品牌: " << brand << endl << endl << endl;
    }
    void Show3()            //购买某一个商品后打印内容
    {
        cout << "商品名: " << name << endl << "种类:" << kind << endl << "售出价： " << purchaseprice << endl << "剩余商品数量: " << stockamount << endl << "生产商品牌: " <<
            brand << endl << "商品的产地: " << place << endl << endl << endl << "共计花费：" << money << endl << endl << endl;
    }
};
class ObjectsInformation : public Objects            // ObjectsInformation类
{
public:                                             //公共权限
    ObjectsInformation();                           //函数声明
    ~ObjectsInformation();
    void showMenu(int n);
    void Find();
    void Save();
    void ModifyItem();
    void RemoveItem();
    void Swap(Objects*, Objects*);
    void my_Sort();
    void purchase();
    int ListCount();

    void Display()                              //统计的时候打印所有商品信息
    {
        system("cls");
        i = 0;
        for (Objects* p = Head->Next; p != End; p = p->Next)
        {
            p->Show2();
            i++;
        }
        cout << "共有" << i << "个商品" << "\n" << endl;
        cout << "输入任意字符！继续……";
        _getch();
    }
    void AddItem()                      //从键盘输入商品信息
    {
        system("cls");
        End->InputName();
        showMenu(1);
        End->InputKind();
        End->InputOther();

        End->Next = new Objects;
        End = End->Next;
        cout << "添加成功!" << endl;
        Save();
        cout << "输入任意字符！继续……";
        _getch();
    }
private:                                 //私有权限
    Objects* Head, * End;
    int i;
    ifstream in;
    ofstream out;
    Objects* FindItem(char* name)           //通过名称查找商品函数
    {
        for (Objects* p = Head; p->Next != End; p = p->Next)
            if (!strcmp(p->Next->name, name))return p;
        return NULL;
    }
    Objects* Findkind(char* kind)            //通过种类查找商品函数               //匹配成功则返回上一个指针，不成功就返回空
    {
        for (Objects* p = Head; p->Next != End; p = p->Next)
            if (!strcmp(p->Next->kind, kind))return p;
        return NULL;
    }
    Objects* Findbrand(char* brand)         // 通过品牌查找商品函数
    {
        for (Objects* p = Head; p->Next != End; p = p->Next)
            if (!strcmp(p->Next->brand, brand))return p;
        return NULL;
    }

};


ObjectsInformation::ObjectsInformation()                 //构造函数         用于检查是否有库存
{
    Head = new Objects;
    Head->Next = new Objects;
    End = Head->Next;
    in.open("supermarket.txt");
    if (!in)

        cout << "                                       " << endl <<
        "                                       " << endl <<
        "                                       " << endl <<
        "\t\t\t\t超市现在没有任何库存了，赶紧进货吧" << endl;
    else
    {
        while (!in.eof())
        {
            End->ReadFile(in);
            if (End->name[0] == '\0')break;
            End->Next = new Objects;
            End = End->Next;
        }
        in.close();
        cout << "    " << endl;
        cout << "    " << endl;
        cout << "    " << endl;
        cout << "    " << endl;
        cout << "\t\t\t\t超市里面还有一些库存，可以看看" << "\n" << endl;
    }
}
ObjectsInformation::~ObjectsInformation()                //析构函数 释放空间
{
    Save();
    for (Objects* temp; Head->Next != End;)
    {
        temp = Head->Next;
        Head->Next = Head->Next->Next;
        delete temp;
    }
    delete Head, End;
}


void ObjectsInformation::showMenu(int n)//菜单      
{
    switch (n)
    {
    case 1:
    {
        cout << "▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉\n"
            << "      1. 食品      2. 化妆品      3. 日用品      4. 饮料      \n"
            << "▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉\n" << endl;
        break; }
    case 2:
    {
        system("cls");
        cout << "                                  " << endl;
        cout << "                                  " << endl;
        cout << "                                  " << endl;
        cout << "                                  " << endl;
        cout << " ☆ ☆ ☆ ☆ ☆ ☆ ☆  ☆   超 市  管 理 系  统     ☆  ☆ ☆ ☆ ☆ ☆ ☆ ☆" << endl;
        cout << "                                  " << endl; cout << "                                  " << endl;
        cout << "           *************        1.增添商品        *************             " << endl;
        cout << "                                  " << endl;
        cout << "           *************        2.统计商品        *************            " << endl;
        cout << "                                  " << endl;
        cout << "           *************        3.查询商品        *************            " << endl;
        cout << "                                  " << endl;
        cout << "           *************        4.删除商品        *************            " << endl;
        cout << "                                  " << endl;
        cout << "           *************        5.修改商品        *************            " << endl;
        cout << "                                  " << endl;
        cout << "           *************        6.购买商品        *************            " << endl;
        cout << "                                  " << endl;
        cout << "           *************        0.退出系统        *************            " << endl;

        cout << "\t\t\n\t\t\t\t 请选择：0-6" << endl;
        break; }
    case 3:
    {
        system("cls");
        cout << "                                  " << endl;
        cout << "                                  " << endl;

        cout << "                                  " << endl;
        cout << "           *************        1.修改种类          *************            \n ";
        cout << "                                  " << endl;
        cout << "           *************        2.修改名称          *************            \n";
        cout << "                                  " << endl;
        cout << "           *************        3.修改进货价        *************            \n";
        cout << "                                  " << endl;
        cout << "           *************        4.修改售出价        *************            \n";
        cout << "                                  " << endl;
        cout << "           *************        5.修改剩余量        *************            \n ";
        cout << "                                  " << endl;
        cout << "           *************        6.修改产地          *************            \n   ";
        cout << "                                  " << endl;
        cout << "           *************        7.修改品牌          *************            \n   ";
        cout << "                                  " << endl;
        cout << "           *************        8.修改全部信息     *************             " << endl;
        cout << "                                  " << endl;
        cout << "                                  " << endl;
        cout << "            *************        请选择：0-8进行相关操作" << endl;
        break;
    }
    case 4:
    {
        system("cls");
        cout << "                                  " << endl;
        cout << "                                  " << endl;
        cout << "                                  " << endl;
        cout << "*************************************************************************************\n"
            << "\t   1. 按商品价排序            2. 按库存量排序               3. 按生产品牌排序                                   "
            << "**************************************************************************************" << endl;
        cout << "                                  " << endl;
        cout << "                                  " << endl;
        cout << "                                  " << endl;
        cout << "\t\t\n\t\t\t\t  请选择：0-3" << endl;
        break;
    }
    case 5:
    {
        system("cls");
        cout << "                                  " << endl;
        cout << "                                  " << endl;
        cout << "                                  " << endl;
        cout << "*************************************************************************************\n"
            << "\t   1. 按商品名称查询            2. 按商品种类查询               3. 按商品厂家查询                               "
            << "**************************************************************************************" << endl;
        cout << "                                  " << endl;
        cout << "                                  " << endl;
        cout << "                                  " << endl;
        cout << "\t\t\n\t\t\t\t  请选择：0-3" << endl;
    }
    }
}
void ObjectsInformation::Find()       //查找函数
{
    system("cls");
    char name[20], Id[10];
    int x;
    Objects* p = NULL;
    showMenu(5);
    cin >> x;
    switch (x)
    {
    case 1: {cout << "\t\t请输入要查找的商品的名称："; cin >> name;
        if (p = FindItem(name))
        {
            p->Next->Show2();
            cout << "输入任意字符！继续……";
            _getch();
        }
        else
        {
            cout << "\t\t没有找到该名称的商品！" << '\n' << endl;
            cout << "输入任意字符！继续……";
            _getch();
        }
    }break;
    case 2: {cout << "\t\t请输入要查找的商品的种类："; cin >> name;
        if (p = Findkind(kind))
        {
            p->Next->Show2();
            cout << "输入任意字符！继续……";
            _getch();
        }
        else
        {
            cout << "\t\t没有找到该种类的商品！" << '\n' << endl;
            cout << "输入任意字符！继续……";
            _getch();
        }
    }break;
    case 3: {cout << "\t\t请输入要查找的厂家的名称："; cin >> name;
        if (p = Findbrand(brand))
        {
            p->Next->Show2();
            cout << "输入任意字符！继续……";
            _getch();
        }
        else
        {
            cout << "\t\t没有找到该厂家的商品！" << '\n' << endl;
            cout << "输入任意字符！继续……";
            _getch();
        }
    }break;

    }
}
void ObjectsInformation::ModifyItem()         //修改商品信息
{

    showMenu(3);
    int x;
    cin >> x;
    switch (x)
    {

    case 1:
    {
        char name[20];
        Objects* p = NULL;
        cout << "\t\t请输入要修改的商品的名称:"; cin >> name;
        if (p = FindItem(name))
        {
            cout << "\t\t已找到商品的信息，请输入新的信息!" << endl;
            p->Next->InputKind();
            Save();
            cout << "修改成功！" << endl;
            cout << "输入任意字符！继续……";
            _getch();
        }
        else
        {
            cout << "\t\t没有找到您需要的商品!" << endl;
            cout << "输入任意字符！继续……";
            _getch();
        }
        break;
    }
    case 2:
    {
        char name[20];
        Objects* p = NULL;
        cout << "\t\t请输入要修改的商品的名称:"; cin >> name;
        if (p = FindItem(name))
        {
            cout << "\t\t已找到商品的信息，请输入新的信息!" << endl;
            p->Next->InputName();
            Save();
            cout << "修改成功！" << endl;
            cout << "输入任意字符！继续……";
            _getch();
        }
        else
        {
            cout << "\t\t没有找到您需要的商品!" << endl;
            cout << "输入任意字符！继续……";
            _getch();
        }
        break;
    }
    case 3:
    {
        char name[20];
        Objects* p = NULL;
        cout << "\t\t请输入要修改的商品的名称:"; cin >> name;
        if (p = FindItem(name))
        {
            cout << "\t\t已找到商品的信息，请输入新的信息!" << endl;
            p->Next->Inputstockprice();
            Save();
            cout << "修改成功！" << endl;
            cout << "输入任意字符！继续……";
            _getch();
        }
        else
        {
            cout << "\t\t没有找到您需要的商品!" << endl;
            cout << "输入任意字符！继续……";
            _getch();
        }
        break;
    }
    case 4:
    {
        char name[20];
        Objects* p = NULL;
        cout << "\t\t请输入要修改的商品的名称:"; cin >> name;
        if (p = FindItem(name))
        {
            cout << "\t\t已找到商品的信息，请输入新的信息!" << endl;
            p->Next->Inputpurchaseprice();
            Save();
            cout << "修改成功！" << endl;
            cout << "输入任意字符！继续……";
            _getch();
        }
        else
        {
            cout << "\t\t没有找到您需要的商品!" << endl;
            cout << "输入任意字符！继续……";
            _getch();
        }
        break;
    }
    case 5:
    {
        char name[20];
        Objects* p = NULL;
        cout << "\t\t请输入要修改的商品的名称:"; cin >> name;
        if (p = FindItem(name))
        {
            cout << "\t\t已找到商品的信息，请输入新的信息!" << endl;
            p->Next->Inputstockamount();
            Save();
            cout << "修改成功！" << endl;
            cout << "输入任意字符！继续……";
            _getch();
        }
        else
        {
            cout << "\t\t没有找到您需要的商品!" << endl;
            cout << "输入任意字符！继续……";
            _getch();
        }
        break;
    }


    case 6:
    {
        char name[20];
        Objects* p = NULL;
        cout << "\t\t请输入要修改的商品的名称:"; cin >> name;
        if (p = FindItem(name))
        {
            cout << "\t\t已找到商品的信息，请输入新的信息!" << endl;
            p->Next->InputPlace();
            Save();
            cout << "修改成功！" << endl;
            cout << "输入任意字符！继续……";
            _getch();
        }
        else
        {
            cout << "\t\t没有找到您需要的商品!" << endl;
            cout << "输入任意字符！继续……";
            _getch();
        }
        break;
    }
    case 7:
    {
        char name[20];
        Objects* p = NULL;
        cout << "\t\t请输入要修改的商品的名称:"; cin >> name;
        if (p = FindItem(name))
        {
            cout << "\t\t已找到商品的信息，请输入新的信息!" << endl;
            p->Next->Inputbrand();
            Save();
            cout << "修改成功！" << endl;
            cout << "输入任意字符！继续……";
            _getch();
        }
        else
        {
            cout << "\t\t没有找到您需要的商品!" << endl;
            cout << "输入任意字符！继续……";
            _getch();
        }
        break;
    }
    case 8:
    {
        char name[20];
        Objects* p = NULL;
        cout << "\t\t请输入要修改的商品的名称:"; cin >> name;
        if (p = FindItem(name))
        {
            cout << "\t\t已找到商品的信息，请输入新的信息!" << endl;
            p->Next->InputAll();
            Save();
            cout << "修改成功！" << endl;
            cout << "输入任意字符！继续……";
            _getch();
        }
        else
        {
            cout << "\t\t没有找到您需要的商品!" << endl;
            cout << "输入任意字符！继续……";
            _getch();
        }
    }
    }

}
void ObjectsInformation::RemoveItem()          //删除商品信息
{
    system("cls");
    char name[20];
    Objects* p = NULL, * temp = NULL;

    cout << "\t\t请输入要删除的商品的名称:" << endl; cin >> name;
    if (p = FindItem(name))
    {
        temp = p->Next;
        p->Next = p->Next->Next;
        delete temp;
        cout << "\t\t删除成功!" << endl;
        Save();
        cout << "输入任意字符！继续……";
        _getch();
    }
    else
    {
        cout << "\t\t没有找到您需要的商品!" << endl;
        cout << "输入任意字符！继续……";
        _getch();
    }
}
void ObjectsInformation::purchase()           //购买商品
{
    system("cls");
    char name[20]; int i;
    Objects* p = NULL;
    Objects* temp = NULL;

    cout << "\t\t请输入要购买的商品的名称和数量:"; cin >> name; cin >> i;
    if (p = FindItem(name))
    {
        if (p->Next->stockamount > i)
        {
            p->Next->stockamount -= i;
            p->Next->money += i * (p->Next->purchaseprice);
            cout << "商品购买成功!" << "\n";
            cout << "购买商品名称: " << name << "\t" << "数量: " << i << "\n";
            cout << "\n";
            cout << "购买后商品信息: " << endl;


            p->Next->Show3();  //打印购买后的信息

            Save();         //保存信息
            p->Next->money = 0;
            cout << "输入任意字符！继续……";
            _getch();

        }
        else
        {
            cout << "商品数量不够，不能购买" << endl;
            cout << "输入任意字符！继续……";
            _getch();
            purchase();
        }

    }
    else
    {
        cout << "无此种商品，不能购买" << endl;
        cout << "输入任意字符！继续……";
        _getch();
        showMenu(2);
    }

}
void ObjectsInformation::Swap(Objects* p1, Objects* p2)        //交换两个商品的数据  name >> kind >> stockprice >> purchaseprice >> stockamount >> place >> brand ;
{
    Objects* temp = new Objects;
    strcpy_s(temp->name, p1->name);
    strcpy_s(temp->kind, p1->kind);
    temp->stockprice = p1->stockprice;
    temp->purchaseprice = p1->purchaseprice;
    temp->stockamount = p1->stockamount;
    strcpy_s(temp->place, p1->place);
    strcpy_s(temp->brand, p1->brand);


    strcpy_s(p1->name, p2->name);
    strcpy_s(p1->kind, p2->kind);
    strcpy_s(p1->place, p2->place);
    p1->purchaseprice = p2->purchaseprice;
    p1->stockprice = p2->stockprice;
    p1->stockamount = p2->stockamount;
    strcpy_s(p1->brand, p2->brand);


    strcpy_s(p2->name, temp->name);
    strcpy_s(p2->kind, temp->kind);
    strcpy_s(p2->place, temp->place);
    p2->purchaseprice = temp->purchaseprice;
    p2->stockprice = temp->stockprice;
    p2->stockamount = temp->stockamount;
    strcpy_s(p2->brand, temp->brand);
}
int ObjectsInformation::ListCount()       //统计当前链表的记录总数，返回一个整数
{
    if (!Head)
        return 0;
    int n = 0;
    for (Objects* p = Head->Next; p != End; p = p->Next)
    {
        n++;
    }
    return n;
}
void ObjectsInformation::my_Sort()       //排序商品
{
    showMenu(4);
    int x;
    cin >> x;
    switch (x)
    {
    case 1:
    {
        system("cls");
        cout << "\t\t排序中..." << endl;
        cout << "\n";
        Objects* p = NULL, * p1 = NULL, * k = NULL;
        int n = ObjectsInformation::ListCount();
        if (n < 2)
            return;
        for (p = Head->Next; p != End; p = p->Next)
            for (k = p->Next; k != End; k = k->Next)
            {
                if (p->stockprice > k->stockprice)
                {
                    ObjectsInformation::Swap(p, k);
                }
            }
        Display();
        out.open("supermarket.txt");
        for (Objects* q = Head->Next; q != End; q = q->Next)
            out << q->name << "\t" << q->kind << "\t" << q->stockprice << "\t" << q->purchaseprice << "\t" << q->stockamount << "\t" << q->place << "\t" << q->brand << "\t" << '\n';
        out.close();
        cout << "保存信息成功" << endl;
        cout << "排序完成！" << endl;
        _getch();
        return;
    }
    case 2:
    {
        system("cls");
        cout << "\t\t排序中..." << endl;
        cout << "\n";
        Objects* p = NULL, * p1 = NULL, * k = NULL;
        int n = ObjectsInformation::ListCount();
        if (n < 2)
            return;
        for (p = Head->Next; p != End; p = p->Next)
            for (k = p->Next; k != End; k = k->Next)
            {
                if (p->stockamount > k->stockamount)
                {
                    ObjectsInformation::Swap(p, k);
                }
            }
        Display();
        out.open("supermarket.txt");
        for (Objects* q = Head->Next; q != End; q = q->Next)
            out << q->name << "\t" << q->kind << "\t" << q->stockprice << "\t" << q->purchaseprice << "\t" << q->stockamount << "\t" << q->place << "\t" << q->brand << "\t" << '\n';
        out.close();
        cout << "保存信息成功" << endl;
        cout << "排序完成！" << endl;
        _getch();
        return;
    }
    case 3:
    {
        system("cls");
        cout << "\t\t排序中..." << endl;
        cout << "\n";
        Objects* p = NULL, * p1 = NULL, * k = NULL;
        int n = ObjectsInformation::ListCount();
        if (n < 2)
            return;
        for (p = Head->Next; p != End; p = p->Next)
            for (k = p->Next; k != End; k = k->Next)
            {
                if (p->money > k->money)
                {
                    ObjectsInformation::Swap(p, k);
                }
            }
        Display();
        out.open("supermarket.txt");
        for (Objects* q = Head->Next; q != End; q = q->Next)
            out << q->name << "\t" << q->kind << "\t" << q->stockprice << "\t" << q->purchaseprice << "\t" << q->stockamount << "\t" << q->place << "\t" << q->brand << "\t" << '\n';
        out.close();
        cout << "保存信息成功" << endl;
        cout << "排序完成！" << endl;
        _getch();
        return;
    }
    }
}
void ObjectsInformation::Save()       //保存商品信息到文件函数
{

    out.open("supermarket.txt");
    for (Objects* p = Head->Next; p != End; p = p->Next)
        out << p->name << "\t" << p->kind << "\t" << p->stockprice << "\t" << p->purchaseprice << "\t" << p->stockamount << "\t" << p->place << "\t" << p->brand << "\t" << p->money << '\n';

    out.close();
    cout << "保存信息成功" << endl;
}


int main()
{
    cout << "                                  " << endl;
    cout << "                                  " << endl;
    cout << "                                  " << endl;
    cout << "                                  " << endl;
    cout << "                                  ◢ █ █ █ █ █ █ █ █ █ █ █ █ ◣" << endl;
    cout << "                            　　　█ █ █ █ █ █ █ █ █ █ █ █ █ █　" << endl;
    cout << "                            　　　█ █　　　◥ █ █ ◤　　　█ █　" << endl;
    cout << "                            　◢ █ █ █　　　　◥ ◤　　　　█ █ ◣" << endl;
    cout << "                            　▊ ▎ █ █ ◣　　　　　　 　　◢ █ ▊ ▊" << endl;
    cout << "                            　▊ ▎ █ █ ◤　　●　 　●　　◥ █ ▊ ▊" << endl;
    cout << "                            　▊　█ █　　　　　　　　　　█ ▊ ▊" << endl;
    cout << "                            　◥ ▇ █ █　 ▊　　　　　　▊　█ ▇ ◤                     嗨嗨嗨，欢迎光临老八秘制小超市" << endl;             //欢迎界面
    cout << "                            　　　█ █　◥▆ ▄ ▄ ▄ ▄ ▆ ◤　█ ▊　　             ◢▇ ▇◣" << endl;
    cout << "                            ◢ █ █◥◥▆ ▅ ▄ ▂ ▂ ▂ ▂ ▄ ▅ ▆                  ◢█" << endl;
    cout << "                            █ ╳　　　　　　　　　　　　　╳ █　           ◢◤" << endl;
    cout << "                            ◥ █ ◣　　　˙　　　　　˙　◢ █ 　　      ◢◤　 " << endl;
    cout << "                            　　▊　　　　　　　　　　　　　▊　　　　   █" << endl;
    cout << "                            　　▊　　　　　　　　　　　　　▊　　　  ◢◤" << endl;
    cout << "                            　　▊　　　　　　⊕　　　　　　█ ▇ ▇ ▇ ◤　" << endl;
    cout << "                            　◢ █ ▇ ▆ ▆ ▆ ▅ ▅ ▅ ▅ ▆ ▆ ▆ ▇ █ " << endl;
    cout << "                            　▊　　　　　　　　             ▊　 　" << endl;


    ObjectsInformation Grade;

    cout << "                                温馨提示：按任意键进入超市后台";
    _getch();
    int x;
    bool quit = false;
    while (!quit)
    {
        Grade.showMenu(2);
        cin >> x;
        switch (x)
        {
        case 0: {quit = true; break; }  //退回界面
        case 1: {Grade.AddItem(); break; }//添加商品
        case 2: {Grade.my_Sort(); break; }//排序商品
        case 3: {Grade.Find(); break; }//查询商品
        case 4: {Grade.RemoveItem(); break; }//删除商品
        case 5: {Grade.ModifyItem(); break; }//修改商品信息
        case 6: {Grade.purchase(); break; }//购买商品
        case 7: {Grade.Save(); break; }//保存信息
        }
    }
    return 0;
}