What's the “condition” in C interview test?

Question

Would it be possible to print Hello twice using single condition?

if  \"condition\"
  printf (\"Hello\");
else
  printf(\"World\");         


        

Answer 1

If it is on Unix:

if  (fork())
    printf ("Hello");
else
    printf("World");

Ofcoures that doesn't guarantee the order 0f the prints