1  
       2  
       3  typedef struct
       4  {
       5    char str[20];
       6  }STACK;
       7  STACK stack[15];
       8  int level;
       9  rezero ()
      10  {
      11    level = 0;
      12    __builtin_strcpy (stack[level].str, "");
      13  }
      14  
      15