title: Big numbers library in c++
body: <p>I'm doing a project which requires really big numbers, up to 100 digits. I have read that java supports big integers (<code>java.Math.BigInteger</code>), and I want to know if there is something like that in C++. So, here is my question: Is there a standard or non-standard c++ library which implements big integers?</p>
  
  <p><strong>Note:</strong> If there is no standard implementation for big integers, I would like a <em>simple</em> non-standard. Thanks in advance.</p>