title: Code for printf function in C
body: <blockquote>
    <p><strong>Possible Duplicate:</strong><br>
    <a href="https://stackoverflow.com/questions/1127328/source-code-of-c-c-functions">source code of c/c++ functions</a>  </p>
  </blockquote>
  
  
  
  <p>I was wondering where I can find the C code that's used so that when I write printf("Hello World!"); in my C programm to know that it has to print that string to STDOUT. I looked in &lt;stdio.h&gt;, but there I could only find its prototype int printf(const char *format, ...), but not how it looks like internally.</p>