Topic #4: Syntactic Analysis (Parsing) EE 456 – Compiling Techniques Prof. Carl Sable Fall 2003.
Design contex-free grammars that generate: L 1 = { u v : u ∈ {a,b}*, v ∈ {a, c}*, and |u| ≤ |v| ≤ 3 |u| }. L 2 = { a p b q c p a r b 2r : p, q, r ≥ 0 }
Problem of the DAY Create a regular context-free grammar that generates L= {w {a,b}* : the number of a’s in w is not divisible by 3} Hint: start by designing.
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