Is C code still considered C++?

Question

The comment to this answer got me wondering. I\'ve always thought that C was a proper subset of C++, that is, any valid C code is valid C++ code by extension. Am I wrong a

Answer 1

Also note that C99 adds several features which aren't permitted in C++ (or are only supported using vendor extensions), such as builtin _Complex and _Imaginary data types, variable-length arrays (arrays sized at runtime rather than compile time), flexible array members (arrays declared as the last member of a struct that may contain an unspecified number of elements), and more.

For the exhaustive list of incompatibilities between C and C++, including changes with C99, see http://david.tribble.com/text/cdiffs.htm.