1  extern int getch();
       2  extern int class();
       3  
       4  int
       5  token()
       6  {
       7      int state = 1;
       8  
       9      while (1) {
      10  	int c=0;
      11  	c = getch();
      12  	switch (state) {
      13  	case 1: break;
      14  	case 4: break;
      15  	case 5: break;
      16  	case 6: 
      17              {
      18  	        switch (class(c)) {
      19  	        default: break;
      20  	        }
      21  	    } break;
      22  	case 7:	break;
      23  	}
      24      }
      25  }
      26