Discussion
The classic dangling else problem arises because
Answer: B
Correct answer: an else can be attached to either of two enclosing if statements
With a grammar that allows an if without an else, the sentence with two ifs and one else has two parse trees: the else may belong to either. Languages resolve it by rule - the else matches the nearest unmatched if - and grammars encode that by splitting the statement nonterminal into matched and unmatched forms.
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