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

One thing that sets the two apart and comes up in day to day development is linkage and function name mangling. A C function compiled with a C compiler is not accessible to C++ unless the prototype is marked up with extern "C".