understand passing parameters by reference with dynamic allocation

Question

I\'m trying understand how to pass a parameter by reference in C language. So I wrote this code to test the behavior of parameters passing:

#include 

        

Answer 1

The answer posted by nos is correct.

Also note that the first of the two posted programs will actually crash on many systems, when the printf line in main() tries to dereference main's pointer n, which was never set:

   printf("%d.\n", *n);