"Hello world" ,frist program

/**************************************************************************************************************

Now  let 's go!         2005-04-13

**************************************************************************************************************//

#ifdef WIN32//Mey be define at other file

#include <iostream>

using namespace std;

#else

#include <stdio.h>

#endif//WIN32

void main()

{

printf("Hello World!/n");

}

what the difference between #include <> and #include " "?the answer is <> is the library file ," "is user programmed//yse or no? your answeris:

"marco define "be used in the file.Can you tell me more information about Marco?