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The macro expansion must always be parenthesized to protect any lower-precedence operators from the surrounding expression. See also \[[PRE00-A. Prefer inline functions to macros|PRE00-A. Prefer inline functions to macros]\] and \[[PRE01-A. Use parentheses within macros around variable names|PRE01-A. Use parentheses within macros around variable names]\]. |
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References
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\[[Summit 05|AA. C References#Summit 05]\] Question 10.1 \[[ISO/IEC 9899-1999|AA. C References#ISO/IEC 9899-1999]\] Section 6.10, "Preprocessing directives," and Section 5.1.1, "Translation environment" |