Which derivation is also known as canonical derivations?
2023
Which derivation is also known as canonical derivations?
- A.
Left most derivation in reverse
- B.
Left most derivation
- C.
Right most derivation
- D.
Right most derivations in reverse
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Correct answer: C
In the Theory of Computation and Compiler Design, formal languages use context-free grammars to derive strings. A derivation is a sequence of production steps that replaces non-terminals with terminal/non-terminal strings.
Rightmost Derivation (RMD): At each step of the derivation sequence, the rightmost non-terminal in the current sentential form is strictly chosen and replaced first.
Canonical Derivation: By formal computer science definition, a Rightmost Derivation is uniquely termed a Canonical Derivation. This specific relationship forms the structural foundation for bottom-up parsing techniques (like LR parsers), which implicitly trace a rightmost derivation in reverse order.