NEWBIES WANTS HELP: hello.c WONT COMPILE

[ext@freeuk.com]

.. i type "gcc hello.c"
   and i get "/usr/lib/crt1.o(.text+0x36): undefined reference to 'main' "

   this is an example from RedHat book, where i've taken the CD from.
   it contained this code
   "   main()
       {
              printf("Hello World\n");
       }"