Programming

How to know what bit compiler I'm using through the terminal in Linux OS?

Please ask your new question in a new thread instead of hijacking this completely unrelated one.

gcc --version

I am going to close this thread. It is veering off-topic.

However I would like to point out that C and C++ have a special type defined for pointer arithmetic, namely ptrdiff_t, which is a typedef of a platform-specific signed integral type.

You can use a variable of type ptrdiff_t to store the result of subtracting or adding pointers as shown in the following simple example:

Code:

#include <stdlib.h>
int main()
{
  int buf[10];
  ptrdiff_t diff = (&buf[4]) - buf;                   // diff = 4
  diff = buf -(&buf[6]);                              // diff =  -6
}

What are the advantages of ptrdiff_t? Self-documenting and portability - the underlying type may vary across programming models but porting requires no source code changes.