title: unsigned long long to string convert
body: <p>I try to convert unsigned long long to string like this</p>
  
  <pre><code>unsigned long long Data = 12;
  char Str[20];
  
  sprintf(Str, "%lld",Data);
  </code></pre>
  
  <p>when i want to see
  but i always see 00</p>
  
  <pre><code>Str[0],Str[1]....;
  </code></pre>
  
  <p>whats the wrong !!!</p>