#include <iostream>

using std::cout;
using std::endl;

// contains function prototypes for functions srand and rand
#include <cstdlib>

#include <ctime>   // contains prototype for function time

int rollDice( void );  // function prototype

int main()
{
   // enumeration constants represent game status
   enum Status { CONTINUE, WON, LOST };

   int sum;
   int myPoint;

   Status gameStatus;  // can contain CONTINUE, WON or LOST

   // randomize random number generator using current time
   srand( time( 0 ) ); 

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

   // determine game status and point based on sum of dice
   switch ( sum ) {

      // win on first roll
      case 7: 
	   case 11:            
         gameStatus = WON;
         break;

      // lose on first roll
      case 2: 
	   case 3: 
	   case 12:             
         gameStatus = LOST;
         break;

      // remember point
      default:            
         gameStatus = CONTINUE;
         myPoint = sum;
         cout << "Point is " << myPoint << endl;
         break;                // optional   

   } // end switch 

   // while game not complete ...
   while ( gameStatus == CONTINUE ) { 
      sum = rollDice();           // roll dice again

      // determine game status
      if ( sum == myPoint )       // win by making point
         gameStatus = WON;
      else
         if ( sum == 7 )          // lose by rolling 7
            gameStatus = LOST;

   } // end while 

   // display won or lost message
   if ( gameStatus == WON )
      cout << "Player wins" << endl;
   else
      cout << "Player loses" << endl;

   return 0;  // indicates successful termination

} // end main

// roll dice, calculate sum and display results
int rollDice( void )
{
   int die1;
   int die2;
   int workSum;

   die1 = 1 + rand() % 6;  // pick random die1 value
   die2 = 1 + rand() % 6;  // pick random die2 value
   workSum = die1 + die2;  // sum die1 and die2

   // display results of this roll
   cout << "Player rolled " << die1 << " + " << die2
        << " = " << workSum << endl;

   return workSum;         // return sum of dice

} // end main