Relationship is at best one-way only. C++ can mix and use C code. A C++ compiler will do fine with C. A C++ programmer will do more or less reasonable C code.

Relationship is at best one-way only. C++ can mix and use C code. A C++ compiler will do fine with C. A C++ programmer will do more or less reasonable C code. C code will not accept C++. A C compiler will not support C++ (unless it's explicitly designed as a C++ compiler too). A C-only programmer will be as lost on a C++ codebase as on a Rust, Go or Java codebase.