why C is still used when C++ is available? Reason

 The main advantage of C is C has the small standard library is that providing a working ISO C environment is much easier than it is with other languages (including C++), and consequently porting C to a new platform is relatively easy.There are also some advantages like Focusing more on details, uses little less memory compared to C++, and as already many Kernals, OS and other System softwares are on C so for the next version also people are using C and C little bit faster than C++(Other than first point I don't know the reason exactly how c is faster compared to C++ when OOP concepts are not used in C++ . )

I am giving two reasons:-

1.It is easier to perform the programing of mouse and other system related processes with C.
2.Secondly what i feel has been missed over here is that C++ is much sophistacated version of C which allows the much useful Object Oriented Paradigm ideal in case of application designs.Now for learners it is very difficult to learn the C++ without having a knowledge of C.As much as the synatax of C++ and Java are concerned they follow the same format approximately like C.So without knowing the lower level one cannot proceed to the upper.Correct me if I am wrong.

regards,
sajee