Given a list of syntax errors from a compiler, a programmer should focus attention on which error(s), before recompiling?

Question

BlackTom AI · Accepted Answer

Compiler error messages usually cascade from an initial syntax fault, so focus on the first reported error. Key concepts: lexical analysis and parsing detect the earliest point where the token stream does not match the language grammar; the parser then attempts error recovery which often produces spurious, follow-up diagnostics. Fixing the first error often resolves many of these subsequent messages.

Step-by-step reasoning:
1. The compiler scans source code into tokens and the parser constructs a syntactic structure. If it encounters an unexpected token, it emits an error at that location (the first error).
2. To continue and provide more diagnostics, the parser makes guesses (inserts/deletes tokens or synchronizes at statement boundaries). Those guesses can make later parts of the file look invalid, so multiple later errors are commonly artifacts of the parser’s recovery, not independent problems.
3. Example: consider C-like code:
   int a = 5
   int b = 6;
   printf("%d
", a + b);
   The missing semicolon after "int a = 5" is the first error. After that, the parser may interpret "int b" as part of the same declaration and produce confusing additional errors about unexpected tokens or type declarations. Fixing the missing semicolon removes those follow-on errors.
4. Therefore, the efficient debugging workflow is: fix the first reported syntax error, recompile, and then address any new errors the compiler reports.

Why the correct answer is correct: the first error pinpoints where the parser’s assumptions first failed; subsequent errors are frequently dependent artifacts. Other options are incorrect because:
- "The middle error only" or "The last error only": focusing on a later error risks leaving the initial cause unaddressed and yields more spurious messages.
- "All the errors": while ultimately you must address all true issues, attempting to fix all reported messages at once is inefficient because many vanish after the first fix.

Conclusion: The correct approach is "The first error only," which matches the provided answer.

Given a list of syntax errors from a compiler, a programmer should focus attention on which error(s), before recompiling?单项选择题

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