title: c++ linker , how to link the iostream file?
body: <p>I have a file named <code>main.cpp</code> which includes <code>iostream</code>.</p>
  
  <p>I compiled <code>main.cpp</code> and it worked without errors, so my question is: I compiled <code>main.cpp</code> and I did not link <code>iostream</code> with <code>main.cpp</code>, so how could this be possible? Or did the compiler linked the <code>iostream</code> automatically?</p>