beginning programming question

[root]

First time poster.

I am attempting to teach myself C++ and am having some problems.
I installed Linux mandrake 7.1 on an old 486 box I have. I am not
running any xwindows. I have emacs installed an am able to create and
write a file: hello.cpp (from the book I am using to teach myself)

#include <iostream>
using namespace std;

int main()
{
    cout << "Hello World!\n";
    return 0;
}

When I attempt to compile with gcc, g++, or c++ commands, i recieve a
iostream "Nosuch file or directory" error.
Do anyone know how I can verify that I have the correct libraries
installed and if not 'how to'?