C language is too simple, in fact, I haven't read it except one or two C manuals 20 years ago: there was no C language course in universities at that time. I studied assembly in the early years of college, and in the first few years of my work, I understood C from assembly, so it is not difficult to understand the common pointer problem of C-absolute fact. If you have studied the operating system, the actual file is not a problem: the difficulty of C language is not the language itself, but the computer knowledge outside the language. If you don't know the knowledge of computer systems, pointers are naturally difficult. First, recommend an architectural book: after reading this book, I believe you will think that something as simple as a pointer can go wrong. Before learning C language, it is suggested that several basic courses of computer must be solid: computer principle, data structure, operating system and so on. Otherwise, C will be difficult to understand: in fact, it's not that you don't know grammar, but that you don't know what he is saying.

There is no C book. Recommend some c++ books. I suggest you read the special edition of c++ Programming and Introduction first. If it's a school library, I suggest looking for Hou Jie's books: these are books I read in my early years, and it's hard to buy them now.