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 ( printf("Hello")==0)

see [http://www.coders2020.com/what-does-printf-return]

(matt corrected my =, thanks, C is far away)