title: dollar sign in variable name?
body: <p>I stumbled on some C++ code like this:</p>
  
  <pre><code>int $T$S;
  </code></pre>
  
  <p>First I thought that it was some sort of PHP code or something wrongly pasted in there but it compiles and runs nicely (on MSVC 2008).</p>
  
  <p>What kind of characters are valid for variables in C++ and are there any other weird characters you can use?</p>