Discussion
The principal task of the lexical analyser is to
Answer: A
Correct answer: group the input characters into lexemes and produce tokens
The scanner is the compiler’s first phase and its job is purely one of recognition: read the character stream, decide where one lexeme ends and the next begins, and hand the parser a stream of tokens with their attributes. Checking the grammar belongs to the parser, type checking to semantic analysis, and instruction selection to the back end.
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