//3_6.cpp
#include <iostream>
#include <cstdlib>
using namespace std;
int rolldice(void);
void main()
{
  int gamestatus,sum,mypoint;
  unsigned seed; 
  cout<<"Please enter an unsigned integer:";
  cin>>seed;//輸入隨機數種子
  srand(seed);//將種子傳遞給rand()
  sum=rolldice(); //第一輪投骰子、計算和數
  switch(sum)
  {
    case 7:   //如果和數為7或11則為勝,狀態為1
    case 11:
           gamestatus=1;
            break;
    case 2:   //和數為2、3或12則為負,狀態為1
    case 3: 
    case 12:
           gamestatus=2;
           break;
    default:   //其它情況,游戲尚無結果,狀態為0,記下點數,為下一輪做準備
           gamestatus=0;
           mypoint=sum  ;
           cout<<"point is "<<mypoint<<endl;
    break;
  }
  while (gamestatus==0)  //只要狀態仍為0,就繼續進行下一輪
  {
    sum=rolldice();
    if(sum==mypoint)    //某輪的和數等于點數則取勝,狀態置為1
      gamestatus=1  ;
    else
      if (  sum==7  )    //出現和數為7則為負,狀態置為2
        gamestatus=2;
  }
//當狀態不為0時上面的循環結束,以下程序段輸出游戲結果
  if(  gamestatus==1  )
    cout<<"player wins\n";
  else
    cout<<"player loses\n";
}
int rolldice(void)
{ //投骰子、計算和數、輸出和數
  int die1,die2,worksum;
  die1=1+rand()%6;
  die2=1+rand()%6;
  worksum=die1+die2;
  cout<<"player rolled "<<die1<<'+'<<die2<<'='<<worksum<<endl;
  return worksum;
}