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The order of these translation phases is specified by ANSI C:
??= # ??' ^ ??- ~ ??! | ??( [ ??/ \ ??) ] ??< { ??> }These sequences must be understood by ANSI C compilers, but they should not be used except (possibly) to obscure code. The ANSI C compiler warns you whenever it replaces a trigraph while in transition (-Xt) mode, even in comments. For example, consider the following:
/* comment *??/ /* still comment? */The ??/ becomes a backslash. This character and the following newline are removed. The resulting characters are
/* comment */* still comment? */The first / from the second line is the end of the comment. The next token is the *.