I'm getting strange syntax errors inside lines I've #ifdeffed out.
Under ANSI C, the text inside a ``turned off'' #if, #ifdef, or #ifndef must still consist of ``valid preprocessing tokens.'' This means that there must be no newlines inside quotes, and no unterminated comments or quotes (note particularly that an apostrophe within a contracted word looks like the beginning of a character constant). Therefore, natural-language comments and pseudocode should always be written between the ``official'' comment delimiters /* and */. (But see question 20.20, and also 10.25.)
References:
ANSI Sec. 2.1.1.2, Sec. 3.1
ISO Sec. 5.1.1.2, Sec. 6.1
H&S Sec. 3.2 p. 40
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