# include <cstdlib>
# include <iostream>

using namespace std;

int main ( )
//
//  THREE_HEADS.CPP simulates a situation in which we flip three coins,
//  and win if we get three heads.  
//
//  Each game costs 25 cents, and we keep playing until we win 10 times.
//
//  By using a "success" counter, the WHILE loop can repeat the statements
//  until we win the desired number of times.
//
{
  int coin1, coin2, coin3, tries, wins;
  float cost;
//
//  Flip 3 coins, get three heads to win.
//
  cost = 0.0;
  tries = 0;
  wins = 0;
  srand ( time ( 0 ) );
  while ( wins < 10 )
  {
//
//  Increase the loop counter.
//
    tries = tries + 1;

    cost = cost + 0.25;

    coin1 = rand ( );
    coin2 = rand ( );
    coin3 = rand ( );
//
//  Each coin variable is a random integer.
//  We will assume a coin comes up "Heads" if the random integer is odd.
//
//  We use the "%" operator to determine if each integer is odd.
//  We use the "&&" operator to say AND.
//
    if ( coin1 % 2 == 0 && 
         coin2 % 2 == 0 && 
         coin3 % 2 == 0 )
    {
      wins = wins + 1;
    }
  }
  cout << "\n";
  cout << "I had to play " << tries << " times.\n";
  cout << "Winning " << wins << " times, I spent $" << cost << "\n";

  return 0;
}