#include <stdlib.h>
#include <stdio.h>
void main ()
{
  printf "Hello world\n"
}

##</code><code>##

#include <stdlib.h>
#include <stdio.h>
void main ()
{
  printf "Hello world\n";
}

##</code><code>##

#include <stdlib.h>
#include <stdio.h>
void main ()
{
  printf("Hello world\n");
}