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)
{
printf("hello");
}
else
{
printf("world");

No need to bother about the return value of printf.