title: substr() from the 1. to the last character C++
body: <p>I would like to use substr() function in order to get the chain of characters from the 1. to the last, without 0.
  Should I do sth like this:
  <code>string str = xyz.substr(1, xyz.length());</code>
  or <code>(xyz.length() - 1)</code> ? And why?</p>