You should have a space between #include and <iostream>.  I'm not sure that
should matter, but it might (since you didn't elaborate on "fail").

Several differences:

1. #include <file> and #include "file" both search for and insert the
contents of the named file.  using "file" will result in the directory where
the #include occurs being searched followed by the directories on the
include path, while using <file> will search only the directories on the
include path.

2. <iostream> is the header for the C++ standard stream classes, while
"stdio.h" (or more properly, <stdio.h>) is the header for the C standard I/O
functions and types.

You'd have to elaborate on "failed".  Failed how?  What error message(s)
appeared?

-cd

you forgot dot h
write
#include<iostream.h>
the different:
in iostream you have the c++ stream input/output library
in stdio you have the c standart input/output library
you can read it in the on line MSDN