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Two consecutive question marks signify the start of a trigraph sequence. According to the C99 Standard \[[ISO/IEC 9899:1999|AA. References#ISOBibliography#ISO/IEC 9899-1999]\]: |
All occurrences in a source file of the following sequences of three characters (that is, trigraph sequences) are replaced with the corresponding single character.
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]
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}
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\[[ISO/IEC 9899:1999|AA. References#ISOBibliography#ISO/IEC 9899-1999]\] Section 5.2.1.1, "Trigraph sequences" \[[MISRA 04|AA. References#MISRABibliography#MISRA 04]\] Rule 4.2 |
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PRE06-C. Enclose header files in an inclusion guard 01. Preprocessor (PRE)