C++ 超市管理系统

#include<iostream>
#include<fstream>
#include<ctype.h>
#include<stdlib.h>
#include<string.h>
using namespace std;
int n=0; //全局数据,结点数量
class Goods
{
protected:
    char name[20]; //商品名称
    double num; //商品代码
    char person[30]; //经办人
    int price; //进货价
    double amount; //库存量
    Goods *next;
public:
    Goods(double num,char*name,char*person,int price,double amount)
    {
        this->num=num;
        strcpy(this->name,name);
        strcpy(this->person,person);
        this->price=price;
        this->amount=amount;
    }
    void Output()
    {
        cout<<"num:"<<num<<" name:"<<name<<" person:"<<person<<" price:"<<price<<" amount:"<<amount<<endl;
}
    friend class Supermarket;

};
class Supermarket
{
private:
    Goods *goods; //商品表
    void Clear(); //清除内存中数据
public:
    Supermarket()
    {
        goods=NULL;
        Load();
    }
~Supermarket()
    {
        Goods*p;
        p=goods;
        while(p)
        {
            p=p->next;
            delete goods;
            goods=p;
        }
        goods=NULL;
    }
    void Add(); //增加商品
    void Delete(); //删除商品
    void Modify(); //修改商品
    void Query(); //查询商品
    void Add_up(); //统计商品
    void Save(); //基础数据存盘