Please help me out with the coding

Dear members,
I am a SE(CSE) student. I m completing a mini-project on BUS RESERVATION SYSTEM. I have ended up on a problem with the update and booking section. I have also completed with the password protection code. But the entire program starts getting problem on execution of that part. I am trying the program using file handling in c++. I have tried with most of the part but just have got these problems.
Please provide me with the necessary guidance and the logic if you can.

/*MINI PROJECT ON BUS RESERVATION SYSTEM*/

#include
#include
#include
#include
#include
#include
#include
#include

class bus
{
int busn,s,fare,i,seat;
char driver[10],arrival[5],depart[5],to[10],date[10],pas_name[20];

fstream x,z;

public:
    void install()
    {
    clrscr();
    z.open("data.txt",ios::app);

    cout<<"\n\n\t\t\t***** BUS RESERVATION SYSTEM *****\n\n";
    cout<<"\t\t\t*******INSTALL*******\n\n";
    for(i=0;i<1;i++)
    {
    cout<<"\n\tSource:Kolhapur";
    cout<<"\n\tEnter bus no: ";
    cin>>busn;
    cout<<"\n\tEnter driver's name: ";
    cin>>driver;
    cout<<"\n\tEnter destination:";
    cin>>to;
    cout<<"\n\tEnter fares:";
    cin>>fare;
    cout<<"\n\tEnter arrival time: ";
    cin>>arrival;
    cout<<"\n\tEnter departure time: ";
    cin>>depart;
    cout<<"\n\tEnter date (dd/mm/yy):";
    cin>>date;
    z<>ch1;
    clrscr();

    switch(ch1)
    {
    case 1:
    cout<<"Enter Bus no.:";
    cin>>busn;
    cout<<"Enter seat no.:";
    cin>>seat;
    cout<<"\n\tBus no.:"<>busn>>driver>>to>>fare>>arrival>>depart>>date;
        if(z.eof()==0)
        {
        cout<<"\nBus no.:"<>busn>>driver>>to>>fare>>arrival>>depart>>date;
        if(z.eof()==0)
        {
        cout<>ch;

switch(ch)
{
    case 1: b.install();
        break;
/*    case 2: b.booking();
        break;
    case 3: b.update();
        break;*/
    case 4: b.show();
        break;
/*    case 5: b.cancel();
        break;*/
    case 6: b.enquiry();
        break;
    case 7: exit(0);
}
}while(ch!=7);
getch();
}