title: Appending ints to char* and then clearing
body: <p>I'm working on a project using an Arduino and as such, I'm reading from a serial port (which sends <code>int</code>s). I need to then write this serial communication to an LCD, which takes a <code>char*</code>.</p>
  
  <p>I need to read several characters from the serial port (two integers) into a string. After both have been received, I then need to clear the string to prepare for the next two characters.</p>
  
  <p><a href="http://en.wiktionary.org/wiki/TLDR" rel="nofollow noreferrer">TLDR</a>: How do I append an <code>int</code> to a <code>char*</code>, and then clear the string after it has two characters?</p>