Simple compiling problem

#include <iostream.h>
void main()
    {
	cout << "hello, World!" << endl;
    }

In file included from /usr/include/c++/4.1.3/backward/iostream.h:31,
                 from hello.cpp:1:
/usr/include/c++/4.1.3/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 <iostream> instead of the deprecated header <iostream.h>. To disable this warning use -Wno-deprecated.
hello.cpp:2: error: ‘::main’ must return ‘int’

#include <iostream>
int main()
    {
	std::cout << "hello, World!" << std::endl;
	return 0;
    }

/tmp/ccuZYfej.o: In function `__static_initialization_and_destruction_0(int, int)':
hello.cpp:(.text+0x23): undefined reference to `std::ios_base::Init::Init()'
/tmp/ccuZYfej.o: In function `__tcf_0':
hello.cpp:(.text+0x6c): undefined reference to `std::ios_base::Init::~Init()'
/tmp/ccuZYfej.o: In function `main':
hello.cpp:(.text+0x8e): undefined reference to `std::cout'
hello.cpp:(.text+0x93): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)'
hello.cpp:(.text+0x9b): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::endl<char, std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&)'
hello.cpp:(.text+0xa3): undefined reference to `std::basic_ostream<char, std::char_traits<char> >::operator<<(std::basic_ostream<char, std::char_traits<char> >& (*)(std::basic_ostream<char, std::char_traits<char> >&))'
/tmp/ccuZYfej.o:(.eh_frame+0x11): undefined reference to `__gxx_personality_v0'
collect2: ld returned 1 exit status