E24 Answer

99 

Comments: This is logically identical to the previous puzzle. The extern declarations of x in fileC.c was not needed. There is just one object x, which is referred to in all three files. The object x is initialized to 8, but then the call to foo() changes it to 99.

/* --- fileA.c --- */
int x = 8



/* --- fileB.c --- */
foo()
{
  extern int x;
  x = 99;
}



/* --- fileC.c --- */
int x;
main()
{
  foo();
  printf("%d\n", x );
  system("pause"); 
}