Programming

Hi friends,
I hope everyone is fine and doing well. I queried in my previous thread about the low-level qualities of C/C++ languages.I really thank you people for explaining, it was really helpful. One more ambiquity that I have in my mind is regarding the unix system calls like open, creat, write, read etc. The system calls that I have mentioned are all used for file manipulation. We also have functions like fopen, fclose in C language for the same purpose. Java, C++/C# also provide classes for file manipulation. Could you please tell me what is the difference between handling files using system calls in c language, and java/C++/C# classes and c functions like fopen etc. Isn't it that the system calls are one of the low-level properties of c language. And is it right to say that Java/C# depend on c language system calls to do their file manipulation jobs, that's why they are considered high-level languages. Unix operating systems provide different system calls, is it possible to use those system calls from languages other than C. Please don't think that I am posting some kind of homework etc, I just want to learn. One more thing which I need your guidance for, I have the intention to build a disk defragmenting and disk filesystem checking software someday. I got know from my previous post, thanks to you people, that these types of software are written in C/C++. Coud you please guide me to some direction i.e. books, source code or anything else, which would help me build such a software. I am looking forward to your wonderful replies.

Thanks in advance!

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