Agile Principles,Patterns,And Practices in C# 之保龄球积分

/* *************************
 * Function:bowling ball for score
 * Reladsed Time:2008-08-11
 * Writer:Robot.H
 * code segment:Agile Principles,Patterns,And Practices in C#
************************* */
public   class  Scorer
{
         // index 
         private   int  ball;
         // there is 21 throw in bowlingball sports
         private   int [] throws  =   new   int [ 21 ];
         // store the current throw
         private   int  currentThrow;
         // chiense meaning is buzhong[补中]
         private   bool  Spare()
        {
             return  throws[ball]  +  throws[ball  +   1 ]  ==   10 ;
        }
         // chiense meaning is quanzhong[全中]
         private   bool  Strike()
        {
             return  throws[ball]  ==   10 ;
        }
         private   int  TwoBallInFrame
        {
             get  {  return  throws[ball]  +  throws[ball  +   1 ]; }
        }
         private   int  NextBallForSpare
        {  get  {  return  throws[ball  +   2 ]; } }
         private   int  NextBallForStrike
        {  get  {  return  throws[ball  +   1 ]  +  throws[ball  +   2 ]; } }

         public    void  AddThrow( int  pins)
        {
            throws[currentThrow ++ ]  =  pins;
        }
         public   int  ScoreForFrame( int  theFrame)
        {
             this .ball  =   0 ;
             int  score = 0 ;
             for  ( int  currframe  =   0 ; currframe  <  theFrame; currframe ++ )
            {
                 if  (Strike())
                {
                    score  +=   10   +  NextBallForStrike;
                    ball ++ ;
                }
                 else   if  (Spare())
                {
                    score  +=   10   +  NextBallForSpare;
                    ball  +=   2 ;
                }
                 else
                {
                    score  +=  TwoBallInFrame;
                    ball  +=   2 ;
                }
            }
             return  score;
}
public   class  Game
{
         private   int  currentFrame  =   0 ;
         private   bool  isFirstThrow  =   true ;
         private  Scorer scorer  =   new  Scorer();

         public   int  Score
        {  get  {  return  ScoreForFrame(currentFrame); } }

         public   void  Add( int  pins)
        {
            scorer.AddThrow(pins);
            AdjustCurrentFrame(pins);
        }
         private   void  AdjustCurrentFrame( int  pins)
        {
             if  (LastBallInFrame(pins))
                AdvanceFrame();
             else
                isFirstThrow  =   false ;
        }
         private   bool  LastBallInFrame( int  pins)
        {
             return  Strike(pins) || ( ! isFirstThrow);
        }
         private   bool  Strike( int  pins)
        { 
             return  (isFirstThrow && pins == 10 );
        }
         private   void  AdvanceFrame()
        {
            currentFrame ++ ;
             if  (currentFrame  >   10 )
                currentFrame  =   10 ;
        }
         public   int  ScoreForFrame( int  currentframe)
        {
             return  scorer.ScoreForFrame(currentframe);
        }
}
     class  Program
    {
         static   void  Main( string [] args)
        {
            Game game  =   new  Game();
            game.Add( 1 );
            game.Add( 4 );
            game.Add( 4 );
            game.Add( 5 );
            game.Add( 6 );
            game.Add( 4 );
            game.Add( 5 );
            game.Add( 5 );
            game.Add( 10 );
            game.Add( 0 );
            game.Add( 1 );
            game.Add( 7 );
            game.Add( 3 );
            game.Add( 6 );
            game.Add( 4 );
            game.Add( 10 );
            game.Add( 2 );
            game.Add( 8 );
            game.Add( 6 );

            Console.WriteLine( " score: "   +  game.Score);
            
            Console.Read();
        }
    }