This is not true. Both ISO C++ and ISO C have have features that are not available in the other language. Therefore, there is no subset or superset relationship.
I would tweak this recommendation. If you want to start with C, consider writing C-style code into .cc or .cpp files, and compile as C++. You will therefore be learning “C++ with functions only” as opposed to “C with classes.”
This is not true. Both ISO C++ and ISO C have have features that are not available in the other language. Therefore, there is no subset or superset relationship.
I would tweak this recommendation. If you want to start with C, consider writing C-style code into .cc or .cpp files, and compile as C++. You will therefore be learning “C++ with functions only” as opposed to “C with classes.”