构造G[E]: E->TE’ E’->+E|ε T->FT’ T’->T|ε F->PF’ F’->*F|ε P->(E)|a|^ 该文法的递归下降分析程

构造G[E]: E->TE’ E’->+E|ε T->FT’ T’->T|ε F->PF’ F’->*F|ε P->(E)|a|^ 该文法的递归下降分析程

Procedure E;
Begin
T ; E’
End ;

Procedure E’ ;
Begin
If sym = ‘ + ’
Then begin
Acvance ;
E
End
End ;

Procedure T ;
Begin
F ; T’
End ;

Procedure T’ ;
Begin
If sym ∈first ( T )
Then T
Else if sym = ‘*’ then error
End ;

Procedure F ;
Begin
If sym ∈first ( P )
P; F’;
End ;

Procedure F’
Begin
If sym = ‘ * ’
Then begin
Advance ;
F’
End
End;
Procedure P
Begin
If sym = ‘ a ’ or sym = ‘ b ‘ or sym = ‘ ^
Then acvance
Else if sym = ‘ ( ‘
Then begin
Advance ;
E ;
If sym = ‘ ) ‘
Then advance
Else error
End
Else error
End;

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