testdb.txt

功能基本实现

1.grammer1 for left recursive eliminate
A->aB
A->Bb
B->Ac
B->d

2.a normal grammer 
S->aH
H->aMd
H->d
M->Ab
M->z
A->aM
A->e

3.simple left recursive eliminate
S->Sa
S->b

4.
S->Sa
S->Sb
S->c
S->d

5
A->Ba
B->Ab

6
S->AB
S->bC
A->z
A->b
B->z
B->aD
C->AD
C->b
D->aS
D->c

7
E
E->E+T
E->T
T->T*F
T->F
F->i
F->(E)

i+i*i#

i*(i+i*i)#