456.txt

编译原理语法分析

main	main
(	(
)	)
{	{
int	int
ID	a
,	,
ID	b
,	,
ID	c
;	;
read	read
ID	a
;	;
read	read
ID	b
;	;
ID	c
=	=
NUM	0
;	;
do	do
{	{
ID	c
=	=
ID	a
*	*
ID	b
;	;
ID	b
=	=
ID	b
+	+
NUM	1
;	;
ID	a
=	=
ID	a
-	-
NUM	1
;	;
}	}
while	while
(	(
ID	b
<=	<=
NUM	20
)	)
write	write
ID	c
;	;
}	}