# include <cstdlib>
# include <iostream>

using namespace std;

int main ( )
//
//  We are going to win $1,000 from Bill Gates by betting on a coin toss.
//
//  If we don't win the first toss, we try again...and again.
//
//  To simulate a coin toss, we call "rand()", which returns a random
//  integer.  If the integer is odd, we win the toss.  
//  In order to get a different random number sequence each time we play,
//  we have to call the "srand ( )" function.
{
  int bet;
  int coin;
  int tries;
  int won;

  srand ( time ( NULL ) );

  won = 0;
  bet = 1000;
  tries = 1;
  coin = rand ( );

  while ( coin % 2 == 0 )
  {
    won = won - bet;
    bet = 2 * bet;
    tries = tries + 1;
    coin = rand ( );
  }

  won = won + bet;

  cout << "\n";
  cout << "Success!\n";
  cout << "After " << tries << " coin flips, Bill Gates paid us $" << bet << "\n";
  cout << "Our total winnings are " << won << "\n";  

  return 0;
}