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 parsing typically halts or produces cascading errors after encountering the first syntax violation, so focus should be on the first reported error.

1) Relevant knowledge points and concepts
- Parsers process source code sequentially; a single syntax error (e.g., missing semicolon, unmatched brace) can leave the parser in an inconsistent state.
- Subsequent error messages are often artifacts caused by the parser attempting to continue from that inconsistent state; these are called "cascading" or "spurious" errors.
- Best practice: fix the earliest reported syntax error and recompile, because many later messages may disappear once the root problem is resolved.

2) Step-by-step reasoning process
- Compiler lists syntax errors in source-order as it parses.
- The first error usually represents the earliest point where the grammar expectation failed.
- Fixing that error restores the parser’s expected state.
- Recompiling produces a new, more accurate set of diagnostics; if other real errors remain, they will now be reported correctly.

3) Calculations / intermediate steps
- No numeric calculations are needed. Logical steps: identify first error → correct it → recompile → observe remaining errors.

4) Why the correct answer is correct
- Because the first reported error is the most likely root cause; addressing it prevents misleading follow-on errors and clarifies whether subsequent messages are real or artifacts. Fixing the first error frequently resolves multiple later messages.

5) Why the other options are incorrect
- "The middle error only": ignores the parsing order; the middle error is often downstream of the true root.
- "All the errors": inefficient and misleading; many listed errors are consequences and will vanish after fixing the first.
- "The last error only": too late—by then the parser’s state has been corrupted and reported messages are unreliable.

6) Conclusion confirming the answer
- Therefore, the programmer should focus on the first error only. This matches the provided correct answer: "The first error only."

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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