title: What can you do in C without "std" includes? Are they part of "C," or just libraries?
body: <p>I apologize if this is a subjective or repeated question. It's sort of awkward to search for, so I wasn't sure what terms to include.</p>
  
  <p>What I'd like to know is what the basic foundation tools/functions are in C when you don't include standard libraries like <code>stdio</code> and <code>stdlib</code>.</p>
  
  <p>What could I do if there's no <code>printf()</code>, <code>fopen()</code>, etc?</p>
  
  <p>Also, are those libraries technically part of the "C" language, or are they just very useful and effectively essential libraries?</p>