 standard deviation
            (scale) unity. Conveniently, this is also the default for this implementation's
            constructor.
          </p>
<pre class="programlisting"><span class="identifier">normal</span> <span class="identifier">N01</span><span class="special">;</span>  <span class="comment">// Default 'standard' normal distribution with zero mean</span>
<span class="keyword">double</span> <span class="identifier">sd</span> <span class="special">=</span> <span class="number">1.</span><span cl