(3,0)program (1,1)abc (30,0); (4,0)var
(1,2)x (32,0), (1,3)y (32,0),
(1,4)z (30,0); (6,0)begin (1,3)y
(29,0):= (2,219)219 (30,0); (1,4)z
(29,0):= (2,37)37 (30,0); (1,2)x
(29,0):= (1,3)y (18,0)* (1,4)z
(30,0); **error(1)** (7,0)end (31,0).
**error(2)** 注释符不搭配