Question

已知文法G(S)为:S→if S else S | if S | a

Answer 1

对于句子：if if a1 else a1 存在两种最左推导一、s => if s else s => if if s else s => if if a1 else a2二、s => if s => if if s else s => if if a1 else a2故文法G(S):S→if S else S | if S | a具有二义性....