Don't try to learn both at the same time as despite the similarity they are very different languages.
If you already know a procedural language then learn C - which is also a procedural language.
If you already know an object oriented language then learn C++ - which is also an object oriented language.
If you don't know any programming style or only know rules based or prototyping or some other style of programming then you will also need to learn abvout the procedural or object oriented style of programming when you learn either of those languages.
Learning your first language that uses a particular style of programming is much harder than learning a second or tenth language that uses a style you already know.
I agree with this info given to him. Before learning C++ and other languages, C is the basic language to learn all programming languages progressively. C is a structure programing wheareas c++ is the object oriented.