#include <stdio.h>

// A global variable in this file:
int i;

// A global variable from another file:
extern int j;

// Attempt to access j2, declared as static in the other file:
extern int j2;

int main ()
{
  i = 5;                     // Access the file variable, as usual.
  printf ("i = %d\n", i);

  j = 6;                     // Access the other file's variable.
  printf ("j = %d\n", j);

  j2 = 7;                    // Attempt to access j2.
  printf ("j = %d\n", j2);
}