Which of the following regular expressions recognizes all C-style identifiers starting with a letter or underscore followed by letters, digits, or underscores?
Identifiers in C must begin with a letter or underscore, followed by zero or more letters, digits, or underscores: (letter | _)(letter | digit | _)*.
Which compiler component strips out comments and redundant whitespace characters from the source code?
The Lexical Analyzer strips out comments, newlines, tabs, and spaces before passing clean tokens to the parser.
How many tokens are in the expression a = b + *c;?
Tokens: 1.a, 2.=, 3.b, 4.+, 5.*, 6.c, 7.;.
What is the purpose of the buffer pair technique (double buffering) in a lexical analyzer?
Double buffering uses two alternating memory buffers to stream characters smoothly from disk, preventing frequent I/O stalls during token lookahead.
Which of the following error types is detected during Lexical Analysis?
Illegal characters or unclosed string literals fail token pattern matching, raising a lexical error.