title: printf/scanf usage and difference from <iostream> and cout/cin diffferences, when to use which?
body: <p>not a question about a particular code, but in C++ the operators scanf/printf using <code>&lt;stdio.h&gt;</code>   seem the same to me as cout or cin in the header      <code>&lt;iostream&gt;</code> so can anyone just explain what the difference between the operators, why and when do we use either one? humbly apologize if this has been asked before, but </p>
  
  <p>Thanks.</p>