C++ doesn't have: PROC – first class nested functions, OP and PRIO – definable operator symbols and priorities, garbage collection, use before define, formatted transput using complex formatting declarations, := – assignment operation symbol, array, automatic UNIONs, CASE expressions, nonlocal GOTO intuitive declaration syntax due to its origin from C.ALGOL 68 doesn't have: public/private struct member access protection, overloaded procedures, explicit memory deallocation, forward declarations textual preprocessing, distinct reference and pointer types, comment lines, struct inheritance, struct member functions, virtual functions. Wikipedia