1/2 六、设文法G(S):S→(L)la Sla L→LbSIS 1.消除文法的左递归和回溯; 2.构造每个非终结符的FIRST集和FOLLOW 3.构造LL(1)分析表。 七、已知文法G[S]: S→bAS | bA A→aSc构造该文法的SLR(1)分析表。
时间: 2024-05-20 10:10:06 浏览: 148
ChitGPT:
1. 对于文法G(S),消除左递归后得到G'(S):S → (L)laSla | laSla,然后再消除回溯,得到G''(S): S → laSlaT, T → ε | (L)laSlaT'. L → LbSI | ε, I → bSI | ε.
2. 对于G''(S)的每个非终结符,构造FIRST集和FOLLOW集,有: FIRST(S) = {la}, FOLLOW(S) = {$}, FIRST(L) = {b, ε}, FOLLOW(L) = {a}, FIRST(I) = {b, ε}, FOLLOW(I) = {a, $}, FIRST(T) = {ε, (}, FOLLOW(T) = {a}.
3. 构造LL(1)分析表见下表:
| | la | ( | ) | lb | a | b | $ |
|---|------|-----|-----|-----|------|------|------|
| S | laSla| (L)laSla | | | | | |
| L | | | ε | LbSI | | ε | |
| I | | | ε | ε | aSc | bSI | a, $ |
| T | ε | (L)laSlaT' | ε | | ε | | ε, a |
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