A top down parser generates ____a) Rightmost Derivation b) Right most derivation in reverse c) Left most derivation d) Left most derivation in reverse
Question
A top down parser generates ____a) Rightmost Derivation b) Right most derivation in reverse c) Left most derivation d) Left most derivation in reverse
Solution
The correct answer is d) Left most derivation in reverse.
A top-down parser starts with the root of the parse tree and the input is consumed from left to right. It generates the leftmost derivation in reverse. This is because it expands the leftmost non-terminal first, but the actual derivations appear in the reverse order as the parser reduces the input to the start symbol.
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