Hi! @ivan
Please kindly note that the YouTube video proposed in the C++ Functions Stanford Lecture is not available anymore (it looks like it has been removed by YouTube).
The lecture is referred to on the following page of the course: C++ Basics / Optional: C++ Functions Stanford Lecture
The broken link is: https://www.youtube.com/embed/FItBvJSjpR4
If you can find another optional lecture for us to watch, it would be great.
Thanks!