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Originally Posted by Dave Scheck
Please not that C compilers are not required to support the double slash style comment.
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For a C compiler to be compliant with the ISO/ANSI C99 standard, it must accept the // style comments. These were not in the earlier C89 standard although most mainsteam compilers accepted them as an extension. The problem is the demand for pure C has dropped in favor of C++ and the bulk of users are probably now in the embedded market. So many of the compilers there haven't been updated to be compliant with the new standard, probably to lower sales volumes. Although recognizing the // style comment should be child's play to a compiler writer whom you're going to entrust with optimizing your source into machine code.