#include <iostream>
#include <fstream>

using namespace std;

void main()
{
   int N;
   int data[2];
   int read[3];
   ofstream fout;
   ifstream finp;

   cout<<"This is a simple program that illustrates how to use binary input output\n\n";
   cout<<"Please enter three integer numbers: ";
   cin>>N>>data[0]>>data[1];

   cout<<"I', about to open a binary file 'bin_fio.bin' ";
   fout.open("bin_fio.bin", ios_base::out | ios_base::binary);
   if( fout.fail() ){
      cerr<<"Error: cannot open file 'bin_fio.bin' for writing\n";
      return;
   }
   cout<<"[OK]\n";

   cout<<"Writing information into the file:\n";
   cout<<"  - first a number: ";
   fout.write(reinterpret_cast<char*>(&N), sizeof(int));
   cout<<sizeof(int)<<" bytes written\n";
   cout<<"  - second an array: ";
   fout.write(reinterpret_cast<char*>(data), sizeof(int)*2);
   cout<<2*sizeof(int)<<" bytes written\n";

   cout<<"Closing the file ";
   fout.close();
   cout<<"[OK]\n";

   cout<<"\nNow, I'm about to read it all back. \nSo, I'm opening the same file for reading ";
   finp.open("bin_fio.bin", ios_base::in | ios_base::binary);
   if( finp.fail() ){
      cerr<<"Error: cannot open file 'bin_fio.bin' for reading\n";
      return;
   }
   cout<<"[OK]\n";

   cout<<"Now, I'm reading the data as an array of three integers ";
   finp.read(reinterpret_cast<char*>(read), sizeof(int)*3);
   cout<<3*sizeof(int)<<" bytes read\n";
   cout<<"The numbers read are:";
   for(int i=0;i<3;i++) cout<<" "<<read[i];
   cout<<"\n";

   cout<<"Closing the file ";
   finp.close();
   cout<<"[OK]\n";
}