Pta:7-58 Book audio-visual rental management

A book and video store rents books and tapes .
Give the following framework for a base class ：
class Publication
{
protected:
string title;// name
float price;// The original price
int day;// Lease term
public:
virtual void display()=0;// Print price list
}
With Publication Base class , structure Book and Tape class .
Generate the above class and write the main function , The main function is required to have a base class Publication Pointer array , Array elements do not exceed 10 individual .
Publication pp[10];
The main function is based on the input information , Corresponding establishment Book, Tape Class object .
Their original rent is ： Lease term 1.2.
in addition , The actual rent charged does not exceed 2 Times the rental valuation .
Book Our valuation is ： Old and new * The original price .
Tape Our valuation is ： The original price /（1+ Number of rentals /3）.
Input format ： One line per test case , The first item is the type of rent ,1 by Book,2 by Tape. Next is the name 、 The original price 、 Lease term . Last item Book Is the degree of newness （0.1 to 1）,Tape Is the number of times it has been rented . With 0 Indicates the end of the input .
Output name required , Original rent ( After the decimal point 1 Decimal place ), If the original rent is greater than 2 Double rent valuation , At the same time, the actual rent that should be charged ( After the decimal point 1 Decimal place ), And marked at the end R.

sample input
1 AAA 19.5 3 0.5
1 BBB 9.5 2 0.1
2 AA 10 2 0
2 DDDD 12.5 2 38
1 FFF 42 3 0.1
0
sample output
AAA 3.6
BBB 2.4 1.9 R
AA 2.4
DDDD 2.4 1.8 R
FFF 3.6

#include<iostream>
using namespace std;
class Publication
{
    
	protected:
		string title;// name 
		float price;// The original price 
		int day;// Lease term 
	public:
		Publication()
		{
    
			;
		}
		Publication(string n,float p,int d)
		{
    
			title=n;
			price=p;
			day=d;
		}
		virtual void display()=0;// Print price list 
};
class Book:public Publication
{
    
	double k;
	public:
		Book(string n,float p,int d,double q):Publication(n,p,d)
		{
    
			k=q;
		}
		virtual void display()
		{
    
			cout<<title<<" ";
			printf("%.1f",day*1.2);
			if(day*1.2>price*k*2)
				printf(" %.1f R",price*k*2);
			cout<<endl;
		}
};
class Tape:public Publication
{
    
	int k;
	public:
		Tape(string n,float p,int d,int q):Publication(n,p,d)
		{
    
			k=q;
		}
		virtual void display()
		{
    
			cout<<title<<" ";
			printf("%.1f",day*1.2);
			if(day*1.2>(price/(k/3+1))*2)
				printf(" %.1f R",(price/(k/3+1))*2);
			cout<<endl;
		}
};
int main()
{
    
	int type;
	cin>>type;
	string n;
	float p;
	int d;
	double q1;
	int q2;
	for(int i=0;type!=0;i++)
	{
    
		Publication *pp;
		cin>>n>>p>>d;
		if(type==1)
		{
    
			cin>>q1;
			pp=new Book(n,p,d,q1);
		}
		else
		{
    
			cin>>q2;
			pp=new Tape(n,p,d,q2);
		}
		pp->display();
		delete pp;
		cin>>type;
	}
}