#include <iostream>
#include <fstream>
#include <cstdlib>

using namespace std;

typedef unsigned char byte;

struct obs
{ short int year;
  byte month, day;
  short int mint, avgt, maxt, prec; };

int main()
{ if (sizeof(obs) != 12)
  { cerr << "Sizeof obs unexpected value " << sizeof(obs) << "\n";
    exit(1); }
  ifstream fin("obs.dat", ios::in | ios::binary);
  if (fin.fail())
  { cerr << "file trouble\n";
    exit(1); }
  int year, month, day, ignore;
  double mint, avgt, maxt, prec;
  fin.seekg(0, ios::end);  // to find size of file move to end and ask position
  int lastrecord = fin.tellg() / sizeof(obs) - 1;
  while (true)
  { cout << "Y M D: ";
    int y, m, d;
    cin >> y >> m >> d;
    int wanted = (y * 10000) + (m * 100) + d;
    int first = 0, last = lastrecord;
    while (true)
    { if (first > last)
      { cout << "not found\n";
        break; }
      int mid = (first + last) / 2;
      fin.seekg(mid * sizeof(obs), ios::beg);
      obs o;
      fin.read((char *)& o, sizeof(o));
      int found = (o.year * 10000) + (o.month * 100) + o.day;
      if (wanted == found)
      { cout << o.year << " " << (int)o.month << " " << (int)o.day << " "
             << (double)o.mint/10 << " "
             << (double)o.avgt/10 << " "
             << (double)o.maxt/10 << " "
             << (double)o.prec/10 << "\n";
        break; }
      if (wanted < found)
        last = mid - 1;
      else
        first = mid + 1; } }
  fin.close(); }