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

Without knowing the return value of printf off the top of your head:

if (printf("Hello") && 0)
    printf("Hello");
else
    printf("World");

Answer 2

Abuse of preprocessing - with cleanup at least.

#define else 
if(1)
{
   printf("hello");
}
else
{
   printf("world");
}
#undef else

Answer 3

if ( printf("Hello")==0)

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

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

Answer 4

 #include<stdio.h>
  int main()
{
 if(! printf("Hello"))
     printf ("Hello");
else
    printf ("World");
 return 0;
}

Because Printf returns the number of character it has printed successfully.

Answer 5

Just put the code before or after the if..else block.

Alternatively, if you have an "if, else if, else" block where you want to execute code in some (but not all) branches, just put it in a separate function and call that function within each block.

Answer 6

if ( printf("Hello") == 0 )
    printf ("Hello");
else
    printf ("World");

:-)