#include<iostream>
#include<fstream>
#include<string.h>
#include<stdlib.h>
#define max 50
using namespace std;
class student
{
char usn[20];
char name[20];
char sem[10];
public:
void read();
void pack();
void unpack();
void modify(char *);
int search1(char *);
} s;
int main ()
{
int ch;
char regno[20];
cout<<"\nFIXED LENGTH RECORDS";
cout<<"\nSIZE OF EACH REC = "<<max;
while (1)
{
cout << "\n1:Pack 2:Unpack 3:Modify 4:Search 5:Exit\n";
cin >> ch;
switch (ch)
{
case 1: s.read ();
s.pack ();
break;
case 2: s.unpack ();
break;
case 3: cout << "Enter USN\n";
cin >> regno;
s.modify (regno);
break;
case 4: cout << "Enter USN to search\n";
cin >> regno;
int f;
f = s.search1 (regno);
if (f == 0)
cout << "Not found\n";
else
cout << "\nFound @" << f <<
"position";
break;
case 5: exit (0);
break;
}
}
}
void student::read ()
{
