I have read “C++ from Beginner to Master” by “明日科技,” but I only understood the main function. I’m not sure what the few lines of code before that are doing.What i can do is just copy the code from the book.i can hardly countinue my c++ learning.What can i do then?
Don’t learn C++. It’s a large and quite complicated. Learn just enough of C++ to do what you need to do (build something useful). There are many sites with example problems if you need inspiration. That said your question is not really suitable (way too broad) and coaching is not really what SO is about.
Always practice after reading each chapter. Go back to the chapter you didn’t understand. Or maybe the book itself is bad, here are the good ones: stackoverflow.com/questions/388242/…