In how much time can I complete learning C++ if I know C...I mean just till the basics and syntax.

Answer 1

It depends on your learning pace and how you understand the lessons/language you are studying. :)

Answer 2

What if I am an average learner and can you say me approximately?

Answer 3

well, we're the same. but for me after I finished one course, I sometimes reset it or try coding on code playground so that I'll understand it well. or maybe you can try reading it again if you can't still understand it :)