北京协和医院药理:大家来教教我，急啊

/*主函数*/
void main()
{
int press;
int bOutWhile=FALSE;/*退出循环标志*/

Init();/*初始化图象，数据*/

while(1)
{
press=GetKey();/*获取用户的按键值*/
switch(CheckKey(press))/*判断按键类别*/
{
/*是退出键*/
case KEYEX99v:
clrscr();/*清屏*/
bOutWhile = TRUE;
break;

/*是落子键*/
case KEYFALLCHESS:
if(ChessGo(gPlayOrder,gCursor)==FALSE)/*走棋*/
DoError();/*落子错误*/
else
{
DoOK();/*落子正确*/

/*如果当前行棋方赢棋*/
if(JudgeWin(gPlayOrder,gCursor)==TRUE)
{
DoWin(gPlayOrder);
bOutWhile = TRUE;/*退出循环标志置为真*/
}
/*否则*/
else
/*交换行棋方*/
ChangeOrder();
ShowOrderMsg(gPlayOrder);
}
break;

/*是光标移动键*/
case KEYMOVECURSOR:
MoveCursor(gPlayOrder,press);
break;

/*是无效键*/
case KEYINVALID:
break;
}

if(bOutWhile==TRUE)
break;
}

/*游戏结束*/
EndGame();
}
/**********************************************************/

/*界面初始化，数据初始化*/
void Init(void)
{
int i,j;
char *Msg[]=
{
"Player1 key:",
" UP----w",
" DOWN--s",
" LEFT--a",
" RIGHT-d",
" DO----space",
"",
"Player2 key:",
" UP----up",
" DOWN--down",
" LEFT--left",
" RIGHT-right",
" DO----ENTER",
"",
"exit game:",
" ESC",
NULL,
};
这个程序是五子棋的一段，他的程序分析怎么弄，大家教教我啊