////////////////////////////
//
// This program reads in information about the geometry
// of a hard drive, then prints out the capacity of the drive,
// in binary and in decimal notation

#include<iostream>
using namespace std;

int main (){

  ////////////
  // Variables

  unsigned long int cylinders = 0;
  unsigned long int sectors = 0;
  unsigned long int heads =0;
  unsigned long int capacity = 0;
  unsigned long int num_gigabytes, num_megabytes, num_kilobytes,
    num_gibibytes, num_mebibytes, num_kibibytes;

  /////////////
  // Constants
  const unsigned long int bytes_per_sector = 512;
  const unsigned long int bytes_per_gigabyte = 1000000000;
  const unsigned long int bytes_per_megabyte = 1000000;
  const unsigned long int bytes_per_kilobyte = 1000;
  const unsigned long int bytes_per_gibibyte = 1073741824;
  const unsigned long int bytes_per_mebibyte = 1048576;
  const unsigned long int bytes_per_kibibyte = 1024;

  ///////////////////
  // Explain what the program does
  
  cout << "This program takes the number of cylinders, sectors, and heads"
       << endl << "on a hard drive and returns the capacity of the drive."
       << endl << endl;

  //cerr << maxint << endl;
  


  // Get the number of cylinders and make sure it is valid
  cout << "Enter number of cylinders: ";
  cin >> cylinders;
  
  if (cylinders <=0) {
    cout << "Sorry, that has to be greater than zero" << endl;
    exit (1);
  }
  
  // Get the number of sectors and make sure it is valid
  cout << "Enter number of sectors: ";
  cin >> sectors;
  
  if (sectors <=0) {
    cout << "Sorry, that has to be greater than zero" << endl;
    exit (1);
  }

  // Get the number of heads and make sure it is valid
  cout << "Enter number of heads: ";
  cin >> heads;
  
  if (heads <=0) {
    cout << "Sorry, that has to be greater than zero" << endl;
    exit (1);
  }

  // Now determine the size of the drive, in bytes
  capacity = bytes_per_sector * cylinders * sectors * heads;
  cout << "Capacity in bytes: " << capacity << endl;

  cout << "The capacity of the disk is: " << endl;
 

  // Now the more trickier part, to figure out how big the drive is
  // and report the data in a nicer format

  // First in decimal bytes
  cout << "Decimal bytes: ";
  num_gigabytes = capacity / bytes_per_gigabyte;
  capacity = capacity % bytes_per_gigabyte;
  cout << num_gigabytes << " GB ";

  num_megabytes = capacity / bytes_per_megabyte;
  capacity = capacity % bytes_per_megabyte;
  cout << num_megabytes << " MB ";

  num_kilobytes = capacity / bytes_per_kilobyte;
  capacity = capacity % bytes_per_kilobyte;
  cout << num_kilobytes << " KB ";
  
  cout << "and " << capacity << " B." << endl;

      
  // Now in bibytes
  cout << "Binary bytes: ";
  capacity = bytes_per_sector * cylinders * sectors * heads;

  num_gibibytes = capacity / bytes_per_gibibyte;
  capacity = capacity % bytes_per_gibibyte;
  cout << num_gibibytes << " GiB ";
  
  num_mebibytes = capacity / bytes_per_mebibyte;
  capacity = capacity % bytes_per_mebibyte;
  cout << num_mebibytes << " MiB ";

  num_kibibytes = capacity / bytes_per_kibibyte;
  capacity = capacity % bytes_per_kibibyte;
  cout << num_kibibytes << " KiB ";
  
  cout << "and " << capacity << " B." << endl;

}