#include <iostream.h>
#include <string.h>
class BookOrder
{ private:
     char BookID[6];
	 int Quantity;
  public:
	 double Price;
	 void BookInit(char*,int,double);
     void BookInfo(void);
};

void BookOrder::BookInit(char* bh,int sl ,double dj)
{
	strcpy(BookID,bh);
	Quantity=sl;
	Price=dj;
}

void BookOrder::BookInfo(void)
{
	cout<<"編 號\t"<<"數量\t"<<"單價\t"<<"總價"<<endl;
	cout<<BookID<<"\t"<<Quantity<<"\t"<<Price<<"\t"<<Price*Quantity<<endl<<endl;
}

void main()
{
	char number[6];
	int amount;
	double price;
	BookOrder bkorder;
	cout<<"輸入訂單信息：圖書編號、數量、單價"<<endl;
	cin>>number>>amount>>price;
	bkorder.BookInit(number,amount,price);
	cout<<"原單價上的訂單內容："<<endl;
    bkorder.BookInfo();
    bkorder.Price*=0.8;
	cout<<"調整單價后的訂單內容："<<endl;
    bkorder.BookInfo();
}