er and upper bound must be provided, as in
the following example.</p>
<pre class="stan"><code>int&lt;lower=0,upper=1&gt; cond;</code></pre>
</div>
<div id="unconstrained-real" class="section level3 unnumbered">
<h3>Unconstrained Real</h3>
<p>Unconstrained real variables are declared using the keyword
<code>real</code>, The following example declares <code>theta</code> to be an
unconstrained continuous value.</p>
<pre class="stan"><code>real theta;</code></pre>
</div>
<div id="constrained-real" class="sectio