Cant debug that error is in adding recored or in displayig

[shan]

#include<fstrea m>
#include<iostre am>
#include<string >
#include<iomani p>
#include<stdlib .h>
#include<conio. h>
#include<stdio. h>

using namespace std;
class library
{
private:
struct lib
{
char flag;
int id;
string title;
string subject;
}books;

fstream file;

public:
library();
void addrec();
void listrec();
void modifyrec();
void delrec();
void recallrec();
void packrec();
void searchid();
void searchttl();
void exit();
};


//Zero argument constructor
library::librar y()
{
file.open("libr ary",ios::binar y|ios::in|ios:: out);
if(!file)
{
cout<<endl<<"Un able to open file.";
exit();
}
}

//Add record
void library::addrec ()
{
char ch;
file.seekp(0L,i os::end);
do
{
cout<<endl<<"En ter book id :";
cin>>books.id;
cout<<endl<<"En ter book title :";
cin>>books.titl e;
cout<<endl<<"En ter book subject :";
cin>>books.subj ect;

books.flag=' ';
file.write((cha r *)&books,sizeof (books));
cout<<"Add another record? (Y/N)";
cin>>ch;

}
while(ch=='y'|| ch=='Y');
}

//List all records
void library::listre c()
{
int j=0;

file.seekg(0L,i os::beg);

while(file.read ((char*)&books, sizeof(books)))
{
if(books.flag!= '*')
{
cout<<endl<<"Re cord NO:"<<j++;
cout<<endl<<"ID is "<<books.id ;
cout<<endl<<"Su bject is "<<books.subjec t;
cout<<endl<<"Ti tle is "<<books.ti tle;
}
}


file.clear();
cout<<endl<<"Pr ess any key...";
getch();
}

//Modify a record
void library::modify rec()
{
int tempid;
int count=0;
long int pos;
cout<<"Enter id of book to modify"<<endl;
cin>>tempid;

file.seekg(0L,i os::beg);

while(file.read ((char*)&books, sizeof(books)))
{
if(books.id==te mpid)
{
cout<<"Enter new record"<<endl;
cout<<endl<<"En ter book id"<<endl;
cin>>books.id;
cout<<endl<<"En ter book title"<<endl;
cin>>books.titl e;
cout<<endl<<"En ter book subject"<<endl;
cin>>books.subj ect;
books.flag=' ';

//place pointer at record which has to
//be over written

pos=count*sizeo f(books);
file.seekp(pos, ios::beg);
file.write((cha r*)&books,sizeo f(books));
return;
}
count++;
}

cout<<endl<<"No book with id "<<tempid<< " is in record";
cout<<endl<<"Pr ess any key...";
getch();

file.clear();
}

//Mark a record for deletion
void library::delrec ()
{
int tempid;
int count=0;
long int pos;
cout<<"Enter id of book to delete"<<endl;
cin>>tempid;

file.seekg(0L,i os::beg);

while(file.read ((char*)&books, sizeof(books)))
{
if(books.id==te mpid)
{
books.flag='*';

pos=count*sizeo f(books);
file.seekp(pos, ios::beg);
file.write((cha r*)&books,sizeo f(books));
return;
}
count++;
}

cout<<endl<<"No book with id "<<tempid<< " is in record";
cout<<endl<<"Pr ess any key";
getch();

file.clear();
}

//Recall the record
void library::recall rec()
{
int tempid;
int count=0;
long int pos;
cout<<"Enter id of book "<<endl;
cin>>tempid;

file.seekg(0L,i os::beg);

while(file.read ((char*)&books, sizeof(books)))
{
if(books.id==te mpid)
{
books.flag=' ';

pos=count*sizeo f(books);
file.seekp(pos, ios::beg);
file.write((cha r*)&books,sizeo f(books));
return;
}
count++;
}

cout<<endl<<"No book with id "<<tempid<< " is in record";
cout<<endl<<"Pr ess any key.....";
getch();

file.clear();
}

//Removes all record permanently
void library::packre c()
{
//temp file
ofstream outfile;
outfile.open("t emp",ios::out) ;

file.seekg(0L,i os::beg);

while(file.read ((char*)&books, sizeof(books)))
{
if(books.flag!= '*')
outfile.write(( char*)&books,si zeof(books));
}

outfile.close() ;
file.close();
remove("library ");
rename("temp"," library");
//file.open("libr ary.dat",ios::b inary|ios::in|i os::out|ios::no create);
file.open("libr ary",ios::binar y|ios::in|ios:: out);
}


//Search by id

void library::search id()
{

int tempid;
cout<<"Enter id of book to search"<<endl;
cin>>tempid;

file.seekg(0L,i os::beg);

while(file.read ((char*)&books, sizeof(books)))
{
if(books.id==te mpid)
{
cout<<endl<<"Re cord NO:";
cout<<endl<<"ID is "<<books.id ;
cout<<endl<<"Su bject is "<<books.subjec t;
cout<<endl<<"Ti tle is "<<books.ti tle;
}

}

cout<<endl<<"Pr ess any key...";
getch();

file.clear();
}


void library::search ttl()
{

string tempttl;
cout<<"Enter title of book to search"<<endl;
cin>>tempttl;

file.seekg(0L,i os::beg);

while(file.read ((char*)&books, sizeof(books)))
{
if(books.title= =tempttl)
{
cout<<endl<<"Re cord NO:";
cout<<endl<<"ID is "<<books.id ;
cout<<endl<<"Su bject is "<<books.subjec t;
cout<<endl<<"Ti tle is "<<books.ti tle;
}

}
cout<<endl<<"Pr ess any key...";
getch();

file.clear();
}

void library::exit()
{
file.close();
}


void main()
{
char choice;
library book;

do
{
//clrscr();
cout<<endl<<"1. Add record"<<endl;
cout<<"2.List records"<<endl;
cout<<"3.Modify records"<<endl;
cout<<"4.Delete records"<<endl;
cout<<"5.Recall records"<<endl;
cout<<"6.Pack records"<<endl;
cout<<"7.Search by ID"<<endl;
cout<<"8.Search by title"<<endl;
cout<<"0.EXIT"< <endl;
cout<<"Enter your choice"<<endl;
cin>>choice;
//clrscr();

switch (choice)
{
case '1':
book.addrec();
break;

case'2':
book.listrec();
break;

case'3':
book.modifyrec( );
break;

case'4':
book.delrec();
break;

case'5':
book.recallrec( );
break;

case'6':
book.packrec();
break;

case'7':
book.searchid() ;
break;

case'8':
book.searchttl( );
break;


case'0':
book.exit();
exit(1);
}
}

while (choice != 0);
}