/*
   fileio2.cpp
   David Klick
   CIS 250
   1/31/05

   demonstration of binary file I/O
*/
#include <fstream>
#include <iostream>
using std::cout;
using std::endl;
using std::ifstream;
using std::ofstream;
using std::ios;

int main(void) {
   int n;
   float x = 0.0f;

   // specify binary when opening file
   ofstream ofile("testfileio2.txt", ios::binary);
   if (!ofile) {
      cout << "Error: couldn't open output file" << endl;
      return 1;
   }

   // use write function to write binary data
   for (n=1; n<10; n++, x+=25) {
      ofile.write(reinterpret_cast<char *>(&n), sizeof(n));
      ofile.write(reinterpret_cast<char *>(&x), sizeof(x));
   }
   ofile.close();

   // specify binary when opening file
   ifstream ifile("testfileio2.txt", ios::binary);
   if (!ifile) {
      cout << "Error: couldn't open input file" << endl;
      return 2;
   }

   // use priming read and loop to read all records
   ifile.read(reinterpret_cast<char *>(&n), sizeof(n));
   ifile.read(reinterpret_cast<char *>(&x), sizeof(x));
   while (ifile) {
      cout << n << ", " << x << endl;
      ifile.read(reinterpret_cast<char *>(&n), sizeof(n));
      ifile.read(reinterpret_cast<char *>(&x), sizeof(x));
   }
   ifile.close();

   return 0;
}