class="special">{</span>
    <span class="special">++</span><span class="identifier">x</span><span class="special">;</span> <span class="comment">// Function body.</span>
<span class="special">}</span>
</pre>
<p>
    </p>
<p>
      The precondition states that at function entry the argument <code class="computeroutput"><span class="identifier">x</span></code>
      must be strictly smaller than the maximum allowable value of its type (so it
      can be incremented by <code class="computeroutput"><span clas