put all lower or all upper
        case (controlled by <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios</span></code> manipulator <code class="computeroutput"><span class="identifier">uppercase</span></code>
        and <code class="computeroutput"><span class="identifier">lowercase</span></code>).
      </p>
<p>
        The function <code class="computeroutput"><span class="identifier">scanf</span></code> and similar
        input f