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c++ beginner on gcc


I am just writing my first c++ program on gcc compiler
and i am not able to compile it. this is the program i
saved in

#include<iostream.h>
void main()
{
  cout<<"hi this is my first program";
}

i typed the command "gcc hi.cpp" 
and this is the message i got. i am not sure about the
gcc compiler version number. i downloaded it recently
from gnu's site.

In file included from
/usr/include/c++/3.2.3/backward/iostream.h:31,
                 from hi.cpp:1:
/usr/include/c++/3.2.3/backward/backward_warning.h:32:2:
warning: #warning This file includes at least one
deprecated or antiquated header. Please consider using
one of the 32 headers found in section 17.4.1.2 of the
C++ standard. Examples include substituting the <X>
header for the <X.h> header for C++ includes, or
<sstream> instead of the deprecated header
<strstream.h>. To disable this warning use
-Wno-deprecated.
hi.cpp:3: `main' must return `int'

please give me reply

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