#include<fstream.h>
#include<conio.h>
#include<stdio.h>
class books
{
		int bcopies;
	public:
		void init()
		{
			cout<<"Enter the no.of copies:";
			cin>>bcopies;
		}
		void putvalue()
		{
			cout<<"Copies:"<<bcopies<<"\n";
		}
};
int choice,n,i;
int main()
{
	clrscr();
	fstream file;
	cout<<"Initialize?(1/2)";
	cin>>choice;
	if(choice==1)
	{
		cout<<"Enter the no. of books:";
		cin>>n;
		--n;
		file.open("library.dat",ios::out|ios::binary|ios::trunc);
		fstream f;
		f.open("n.dat",ios::out|ios::binary);
		f.write((char*)&n,sizeof(int));
		books * B=new books[n];
		for(i=0;i<=n;i++)
		{
			clrscr();
			B[i].init();
			file.write((char*)&B[i],sizeof(books));
		}
		file.close();
		f.close();
 
	}
	fstream f;
	file.open("library.dat",ios::in|ios::binary);
	f.open("n.dat",ios::in|ios::binary);
	books * B=new books[n];
	file.seekg(0,ios::beg);
	file.read((char*)&B[i],sizeof(books));
	for(i=0;i<=n;i++)
	{
 
 
		B[i].putvalue();
	}
	getch();
 
	return 0;
}

fstream f;
	file.open("library.dat",ios::in|ios::binary);
	f.open("n.dat",ios::in|ios::binary);
	f>>n;
	books * B=new books[n];
	file.read((char*)B,sizeof(books));
	for(i=0;i<n;i++)
	{
	       B[i].putvalue();
	}
 
	getch();
	return 0;

#include<fstream.h>
#include<conio.h>
#include<stdio.h>
class books
{
		int bcopies;
	public:
		void getdata()
		{
			cout<<"Enter the no.of copies:";
			cin>>bcopies;
		}
		void dispdata()
		{
			cout<<"Copies:"<<bcopies<<"\n";
		}
};
int main()
{
	clrscr();
	char ch;books B;
	fstream file;
	file.open("library.dat",ios::out|ios::ate|ios::binary|ios::in);
	cout<<"Would you like to add a book?";
	cin>>ch;
	while(ch=='y'||ch=='Y')
	{
		B.getdata();
		file.write((char*)&B,sizeof(books));
		cout<<"Continue?(y/n)";
		cin>>ch;
	}
	cout<<"data:\n";
	file.seekg(0,ios::beg);
	while(file.read((char*)&B,sizeof(B)))
	{
		B.dispdata();
	}
	getch();
	return 0;
}