title: How I can print to stderr in C?
body: <p>In C, Printing to stdout is easy, with <code>printf</code> from <code>stdio.h</code>.</p>
  
  <p>However, how can print to stderr? We can use <code>fprintf</code> to achieve it apparently, but its syntax seems strange. Maybe we can use <code>printf</code> to print to stderr?</p>