nal</span>&nbsp;int_of_char&nbsp;:&nbsp;char&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;int&nbsp;=&nbsp;<span class="string">"%identity"</span><br>
&nbsp;&nbsp;<span class="keyword">val</span>&nbsp;char_of_int&nbsp;:&nbsp;int&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;char<br>
&nbsp;&nbsp;<span class="keyword">external</span>&nbsp;ignore&nbsp;:&nbsp;<span class="keywordsign">'</span>a&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;unit&nbsp;=&nbsp;<span class="string">"%ignore"</span><br>
&nbs