// readrec.cpp
#include <fstream.h>
#include <string.h>

#define MAX 100

// a simplified version of person class 
class Person {
   public:
   char LastName[6];
   char FirstName[6];
   char State[3];
   Person();
};

Person::Person() {
   LastName[0]='\0'; FirstName[0]='\0'; State[0]='\0';
}

// Read from stream a fixed length record and places in p
// Fields have sizes: 5, 5 and 2 respectively

int ReadRecPerson(fstream & stream, Person & p) {
   stream.getline(p.LastName,6); // reads 5 characters or default delimiter '\n'
   stream.clear();               // when delimiter not found "fail" flag is set
                                 // this clears "fail" flag 
   if (strlen(p.LastName)==0) return 0;
   stream.getline(p.FirstName,6); stream.clear(); 
   stream.getline(p.State,3); stream.clear();   
   return 1;
}

// Write to stream the Data in p
int WriteRecPerson(fstream & stream, Person & p) {
   stream << p.LastName << p.FirstName << p.State << endl;
}

// Read records from "in.txt" and write in "out.txt" in reverse order 
// (first record last, last record first)
int main() {
   fstream infile;
   fstream outfile;

   infile.open("in.txt",ios::in);
   outfile.open("out.txt",ios::out);

   Person people[MAX]; int i,n=0;

   if (infile.fail()) {  // if file does not exist, abandon program
      cerr <<"File open failed!\n";
      return 0; 
   }

   while ((ReadRecPerson(infile,people[n]) != 0) && (n<MAX)) 
      n++;

   for (int i=n-1; i>=0 ; i--)
      WriteRecPerson(outfile,people[i]);
 
   infile.close();
   outfile.close();

   return 1;
}