无下落俄罗斯方块和右侧下一个俄罗斯方块显示错误

这是我的代码

 //清除俄罗斯方块的下落痕迹 

 void CleanTetris(struct Tetris *tetris)

 {

  for(i=0;i<4;i++)

  {

  b[i] = 0;

}

  for(i = tetris->x-2;i<=tetris->x+4;i+=2)

{

for(j = tetris->y-2;j<=tetris->y+1;j++)

{

if(a[i][j] == 0&& j>FrameY)

{

gotoxy(i,j);

printf(" ");

}

}

}

 }

第二个：

//开始游戏

 void Gameplay()

 {

  int n;

  struct Tetris t,*tetris = &t;

  char ch;

  tetris->nember = 0;

  tetris->speed = 300;

  tetris->socre = 0; 

  tetris->level = 1;

  while(1)

  {

  Flag(tetris);

  Temp = tetris->flag;

  tetris->x = FrameX+2*Frame_width+6;

  tetris->y = FrameY+10;

  tetris->flag = tetris->next;

  PrintTetris(tetris);

  tetris->x = FrameX+Frame_width;

  tetris->y = FrameY-1;

  tetris->flag = Temp;

}