1   // Fig. 6.10: fig06_10.cpp
 2   // Craps simulation.
 3   #include <iostream>
 4   #include <cstdlib> // contains prototypes for functions srand and rand
 5   #include <ctime> // contains prototype for function time
 6   using namespace std;
 7
 8   unsigned int rollDice(); // rolls dice, calculates and displays sum
 9
10   int main()
11   {
12      // enumeration with constants that represent the game status 
13      enum Status { CONTINUE, WON, LOST }; // all caps in constants
14
15      // randomize random number generator using current time
16      srand( static_cast<unsigned int>( time( 0 ) ) );
17
18      unsigned int myPoint = 0; // point if no win or loss on first roll
19      Status gameStatus = CONTINUE; // can contain CONTINUE, WON or LOST
20      unsigned int sumOfDice = rollDice(); // first roll of the dice
21
22      // determine game status and point (if needed) based on first roll
23      switch ( sumOfDice )
24      {
25         case 7: // win with 7 on first roll
26         case 11: // win with 11 on first roll
27            gameStatus = WON;
28            break;
29         case 2: // lose with 2 on first roll
30         case 3: // lose with 3 on first roll
31         case 12: // lose with 12 on first roll
32            gameStatus = LOST;
33            break;
34         default: // did not win or lose, so remember point
35            gameStatus = CONTINUE; // game is not over
36            myPoint = sumOfDice; // remember the point
37            cout << "Point is " << myPoint << endl;
38            break; // optional at end of switch
39      } // end switch
40
41      // while game is not complete
42      while ( CONTINUE == gameStatus ) // not WON or LOST
43      {
44         sumOfDice = rollDice(); // roll dice again
45
46         // determine game status
47         if ( sumOfDice == myPoint ) // win by making point
48            gameStatus = WON;
49         else
50            if ( sumOfDice == 7 ) // lose by rolling 7 before point
51               gameStatus = LOST;
52      } // end while
53
54      // display won or lost message
55      if ( WON == gameStatus )
56         cout << "Player wins" << endl;
57      else
58         cout << "Player loses" << endl;
59   } // end main
60
61   // roll dice, calculate sum and display results
62   unsigned int rollDice()
63   {
64      // pick random die values
65      unsigned int die1 = 1 + rand() % 6; // first die roll
66      unsigned int die2 = 1 + rand() % 6; // second die roll
67
68      unsigned int sum = die1 + die2; // compute sum of die values
69
70      // display results of this roll
71      cout << "Player rolled " << die1 << " + " << die2
72         << " = " << sum << endl;
73      return sum; // end function rollDice
74   } // end function rollDice