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<h3>trigraphs</h3>
<p> Controls the use of ISO trigraph sequences.</p>
<h5>Syntax</h5>
<p class="code">#pragma trigraphs on | off | reset</p>
<h5>Targets</h5>
All platforms.<br />
<h5>Remarks</h5>
<p>If you are writing code that must strictly adhere to the ANSI standard, enable this pragma. Listing 10.31 shows an example of a trigraph.</p>
<table width="44%" border="0" cellpadding="2" cellspacing="0">
<tr>
<th scope="col"><div align="center">Trigraph</div></th>
<th scope="col"><div align="center">Character</div></th>
</tr>
<tr class="code">
<td><div align="center">??=</div></td>
<td><div align="center">#</div></td>
</tr>
<tr class="code">
<td><div align="center">??/</div></td>
<td><div align="center">^</div></td>
</tr>
<tr class="code">
<td><div align="center">??(</div></td>
<td><div align="center">[</div></td>
</tr>
<tr class="code">
<td><div align="center">??)</div></td>
<td><div align="center">]</div></td>
</tr>
<tr class="code">
<td><div align="center">??!</div></td>
<td><div align="center">|</div></td>
</tr>
<tr class="code">
<td><div align="center">??<</div></td>
<td><div align="center">{</div></td>
</tr>
<tr class="code">
<td><div align="center">??></div></td>
<td><div align="center">}</div></td>
</tr>
<tr class="code">
<td><div align="center">??-</div></td>
<td><div align="center">~</div></td>
</tr>
</table>
<p class="note"><strong>NOTE</strong> Use of this pragma may cause a portability issue for some targets.</p>
<div class="listing">
<h4>Listing 10.31 Example of Pragma trigraphs</h4>
<p>char c = '????'; // ERROR: Trigraph sequence expands to '??^<br />
char d = '\?\?\?\?'; // OK</p>
</div>
<p>This pragma corresponds to the <a href="../pragmas/p_trigraphs.htm">Expand Trigraphs</a> setting . To check this setting, use <span class="code">__option (trigraphs)</span>, described in <a href="../symbols/sym_settings.htm">Checking Settings</a>. The default setting is <span class="code">off</span>.</p>
<p></p>
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