function?tanchishe（）
global?CloseFlag;
global?SnakeBd;
global?KeyFlag;
global?Slong;
global?fdx;
global?fdy;
global?StartFlag;
StartFlag=1;
MoveSpeed=0.1;
KeyFlag=4;
CloseFlag=0;
h=figure（‘KeyPressFcn‘@KeyPress‘Color‘‘w‘）;
axes（‘parent‘h‘units‘‘points‘‘position‘[180?50?500?500]‘XLimMode‘‘manual‘‘XLim‘[0?50]‘YLimMode‘‘manual‘‘YLim‘[0?50]）;
H=uicontrol（‘parent‘h‘style‘‘text‘‘units‘‘normalized‘‘position‘[0.72?0.7?0.12?0.08]‘string‘0‘BackGroundColor‘[0.5?0.5?0.5]‘FontSize‘25）;
uicontrol（‘parent‘h‘style‘‘pushbutton‘‘units‘‘normalized‘‘position‘[0.72?0.5?0.12?0.08]‘string‘‘開始‘‘FontSize‘12‘BackGroundColor‘[0.5?0.5?0.5]‘callback‘[‘global?StartFlag;StartFlag=0;‘]）;
uicontrol（‘parent‘h‘style‘‘pushbutton‘‘units‘‘normalized‘‘position‘[0.72?0.3?0.12?0.08]‘string‘‘停止‘‘FontSize‘12‘BackGroundColor‘[0.5?0.5?0.5]‘callback‘[‘global?CloseFlag;CloseFlag=1;‘]）;

StartSnake（）;
while?1
????if?（KeyFlag==1&&SnakeBd（Slong2）==49）||（KeyFlag==2&&SnakeBd（Slong2）==0）||（KeyFlag==3&&SnakeBd（Slong1）==0）||（KeyFlag==4&&SnakeBd（Slong1）==49）||（CloseFlag==1）||（KeyFlag==5）
????????a=text（1924‘GAME?OVER!‘）;
????????set（a‘FontSize‘20）;
????????break;
????end??
????if?SnakeBd（Slong:）==[fdxfdy]
????????Slong=Slong+1;
????????set（H‘string‘Slong-3）;
????????switch?KeyFlag
????????????case?1
????????????????SnakeBd（Slong:）=[fdxfdy+1];
????????????case?2
????????????????SnakeBd（Slong:）=[fdxfdy-1];
????????????case?3
????????????????SnakeBd（Slong:）=[fdx-1fdy];
????????????case?4
????????????????SnakeBd（Slong:）=[fdx+1fdy];
????????end
????????food（）;
????else
????Move（KeyFlag1）;
????end
????pause（MoveSpeed）;
????if?Slong==13
????????b=text（1924‘PASSED‘）;
????????set（b‘FontSize‘20）;
????????pause（2）;
????????MoveSpeed=MoveSpeed/2;
????????cla;
???????