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(gcc-300.info)C++ Comments

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C++ Style Comments
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   In GNU C, you may use C++ style comments, which start with `//' and
continue until the end of the line.  Many other C implementations allow
such comments, and they are likely to be in a future C standard.
However, C++ style comments are not recognized if you specify `-ansi',
a `-std' option specifying a version of ISO C before C99, or
`-traditional', since they are incompatible with traditional constructs
like `dividend//*comment*/divisor'.