Have you ever tried to compile an old C program which extensively used variables called 'old' and 'new' with a C++ compiler? I have. Also, C++ doesn't allow im

Have you ever tried to compile an old C program which extensively used variables called 'old' and 'new' with a C++ compiler? I have. Also, C++ doesn't allow implicit casts from void* to any pointer type, which is a common C idiom.