Putting a composite statement in the condition of a for loop

Question

I have a contrived example to demonstrate the request for a specific functionality - I wonder if anyone has a clever trick to do this.

The following is a problem one

Answer 1

I have used the following type of construct for this situation. It is not more efficient (still has a condition at each iteration), but I like it because it results in a single printf:

char *sep = " ";
for(ii=0; ii<4; ii++) {
  if ( ii == 3 )
    sep = "\n";
  printf( "%d%s", ii, sep );
}