title: How do I format Int32 numbers?
body: <p>What is the best way to get formatted Int32 numbers?</p>
  
  <p>Let say I have this <code>o</code> function:</p>
  
  <pre><code>string o(int x);
  </code></pre>
  
  <p>This is the value that <code>o</code> need to return according to <code>x</code></p>
  
  <pre><code>x = 0    =&gt;    o = 00
  x = 1    =&gt;    o = 01
  x = 5    =&gt;    o = 05
  x = 10   =&gt;    o = 10
  x = 31   =&gt;    o = 31
  x = 106  =&gt;    o = 106
  </code></pre>