First of all there is no rule written that, the Linux users should use the Linux commands and system calls. Noway...

My friend's grand mother is using Ubuntu and of-course she is also a Linux user.

As Developer, you are not left to use Linux alone. Whatever you are doing in Linux as a Developer, all are possible with other paid OS [Hope you guessed :-) ] .

If you google it, you can find easily why c++ came . The Kernel is written in C, it can be even in asm, but very difficult to upgrade/change a single thing.

I strongly agree with whatever Marc Deop told.

Basically, its not like [ c > c++ } | [c++ > c ]. Its purely based on, what is objective of that final code output, where they going to deploy and who is going to use.

I really don't know what you want to express.

If u write the code with C:

#ifdef __cplusplus   /* or  #if defined(__cplusplus) */

Extern "C" {

#endif 



/*  your code below */



#ifdef __cplusplus

}

#endif

If u write the code with C++:

#include <pthread.h>  /* this can use a c head file */

#include <iostream>   /* this is a c++ head file */