// Fig. 3.10: fig03_10.cpp
// Craps
#include <iostream.h>
#include <stdlib.h>
#include <time.h>

int rollDice( void );  // function prototype
enum Status { CONTINUE, WON, LOST };
Status playAGame();
int rolls = 0;


int main( int argc, char* argv[] ) {

   int numPlays = 1;
   if ( argc > 1 ) {
     numPlays = atoi( argv[1] );
   }

   unsigned int t = time( 0 );
   srand( t );

   int wins = 0;
   int n = numPlays;
   while ( n-- > 0 ) {
      if ( playAGame() == WON ) wins++;
   }
   cout << numPlays << " games were played." << endl;
   cout << "Winning percentage was " << wins/(double)numPlays << endl;
   cout << "Dice rolls per game averaged " << (double)rolls/numPlays << endl;
   cout << "Total number of rolls of the dice pair was " << rolls << endl;
}
     
Status playAGame()
{
   int sum, myPoint;
   Status gameStatus;

   sum = rollDice();            // first roll of the dice

   switch ( sum ) {
      case 7: case 11:           // win on first roll
         gameStatus = WON;
         break;
      case 2: case 3: case 12:    // lose on first roll
         gameStatus = LOST;
         break;
      default:                 // remember point
         gameStatus = CONTINUE;
         myPoint = sum;
         //cout << "Point is " << myPoint << endl;
         break;                // optional   
   }

   while ( gameStatus == CONTINUE ) {    // keep rolling
      sum = rollDice();

      if ( sum == myPoint )       // win by making point
         gameStatus = WON;
      else if ( sum == 7 )          // lose by rolling 7
         gameStatus = LOST;
      else
	 ; //just continue
   }

   return gameStatus;
}

int rollDice( void )
{
   int die1, die2;

   rolls++;
   die1 = 1 + rand() % 6;
   die2 = 1 + rand() % 6;
   return die1 + die2;
}