CGI written in C

#include 

main ()
{
   printf ("Content-type: text/html\n");
   printf ("\n");
   printf ("\n");
   printf ("\n");
   printf ("\n");
   printf ("\n");
   printf ("\n");
   printf ("\n");
   printf ("
Hello, world!
\n");
   printf ("\n");
   printf ("\n");
}