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

int rollDice( void ); // function prototype

int main()
{
enum Status { CONTINUE, WON, LOST };
int sum, myPoint;
Status gameStatus;

srand( time( NULL ) );
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;
}

if ( gameStatus == WON )
cout << "Player wins" << endl;
else
cout << "Player loses" << endl;

return 0;
}

int rollDice( void )
{
int die1, die2, workSum;

die1 = 1 + rand() % 6;
die2 = 1 + rand() % 6;
workSum = die1 + die2;
cout << "Player rolled " << die1 << " + " << die2
<< " = " << workSum << endl;

return workSum;
}
以下是书上说的这些代码的功能。
每个骰子有六面，这些面包含1，2，3，4，5，6个点。投两枚骰子之后，计算点数之和。如果第一次投时的和为7或11，则游戏者获胜。如果第一次投时的和是2，3或12，则游戏者输，庄家赢。如果第一次投时的和为4,5,6,8,9或10，则这个和成为游戏者的点数。要想赢，就要继续投骰子，直到赚到点数。如果投七次之后还没有赚到点数，则游戏者输。

但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;
这段的功能根就不对，弄的我想了好长时间。结果是我对了。