Introduction - If you have any usage issues, please Google them yourself
		 
#include <iostream>
#include <string>
using namespace std 
class Goods
{public:
        Goods(char*GoodsNum,string n,double p,int a)
		{
	    strcpy(GoodsNumber,GoodsNum)  
        GoodsName=n 
		GoodsPrice=p 
		GoodsAmount=a 
		}//构造函数,商品的编号,名字,价格,数量
        ~Goods(){}
		friend class Manager 
        
		int quantity  //声明购买数量
        static float TotalPrice() //声明所购买商品的总价格
        
		string get_GoodsName() const 
        double get_GoodsPrice() const 
        int get_GoodsAmount() 
         
        void SetGoodsNumber(char*)            //设置编号函数
		void SetGoodsName(string)             //设置姓名函数
		void SetGoodsPrice(double pr)         //设置价格函数
		void SetGoodsAmount(int am)           //设置数量函数
        int SetGoodsGuaPeriod(int y,int m,int d){} //设置保质期函数
		void PrintGuaPeriod()                 //输出保质期
private: char GoodsNumber[3] 
		 string GoodsName 
		 double GoodsPrice