#include <iostream.h>
#include <fstream.h>
#include <math.h>


//////////////////////////////////////////////////////////////////////
//This file is part of a chain of processes..  it is not meant to be
//run directly..  the script 'runme' has to make a file 'grepfile' for
//this program to look at and generate a number from..
//When this program is done running, there will be a file 'random.byte'
//in this directory..  The java class 'sendrn' will read the integer
//out of 'random.byte' and send it to the random number server..
//////////////////////////////////////////////////////////////////////

main () {
  ifstream fin("grepfile");                  //open filestream, error if not
  if ( !fin ) {
    cout << "run the script file, this program is not meant to be " 
	 << "executed directly.. Run the script 'runme'" << endl;
    exit(1);
  }

  int rn=0;                                       //some variables..
  char tmp[60];
  int pid;
  for ( int i=0 ; i<8 ; i++ ) {                      //for each bit (line
    fin >> pid;                                     //in grepfile)
    fin.getline(tmp,60,'\n');
    if ( !fin ) {
      cout << "corrupt grepfile.." << endl;
      exit(1);
    }
    if ( pid%2 == 0 ) {                          //if pid is even, do nothing
    }
    else {                                       //if odd, record a '1' for
      rn=rn+(int)pow(2,i);                      //that bit, update RN
    }

  }

  ofstream fout("random.byte");                  
  if ( !fout ) {
    cerr << "error opening outfilestream : random.byte" << endl;
    exit(1);
  }
  fout << (char)rn;                              //write the random number
  cout << rn << " ";
  return 0;                                     //into a file for the next
}                                              //prg in the chain to process