C++ menu driven program to enter, display and see aperticular record based on roll number using files

#include<fstream.h>
#include<conio.h>
#include<stdlib.h>
#include<stdio.h>
#include<string.h>
class student
{   private : int rno, percent;
     char name[50];
    public : void accp();
    void disp();
    int getrno()
    {    return rno;
    }
}s1;
void main()
{   clrscr();
    int a;
    fstream f1("student.dat",ios::binary|ios::in|ios::app|ios::out);
    if (!f1)
    {  cout<<"\n could not find";
       getch();
       exit(-1);
    }
    cout<<"\n 1. wants to enter 10 records ";
    cout<<"\n 2. want to display records ";
    cout<<"\n 3. want to see a paticular record based on roll no. ";
    cout<<"\n enter your choice : ";
    cin>>a;
    switch(a)
    {   case 1:   for (int i=0; i<4; i++)
 {   s1.accp();
     f1.write ((char*)&s1,sizeof(s1));
 }
 break;

case 2:  f1.seekg(0);
 while (!f1.eof())
 {     f1.read ((char*)&s1,sizeof(s1));
s1.disp();
 }
 break;

case 3:   int rn, b, x=0;
 cout<<"\n roll number to be found : ";
 cin>>rn;
 f1.seekg(0);
 while (!f1.eof())
 {     f1.read ((char*)&s1,sizeof(s1));
b=s1.getrno();
if (b==rn)
{   x=1;
   break;
}
 }
if (x==1)
{   s1.disp();
}
else
cout<<"\n not found";


    }
    f1.close();
    getch();
}
void student::accp()
{   cout<<"\n enter the student name:";
    gets(name);
    cout<<"\n enter the roll number:";
    cin>>rno;
    cout<<"\n enter the percentage:";
    cin>>percent;
    return;
}
void student::disp()
{   cout<<"\n student name:"<<name;
    cout<<"\n roll number:"<<rno;
    cout<<"\n percentage:"<<percent;
    return;
}