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+<title>Using the GNU Compiler Collection (GCC): Conditionals</title>
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+Next: <a href="_005f_005fint128.html#g_t_005f_005fint128" accesskey="n" rel="next">__int128</a>, Previous: <a href="Typeof.html#Typeof" accesskey="p" rel="previous">Typeof</a>, Up: <a href="C-Extensions.html#C-Extensions" accesskey="u" rel="up">C Extensions</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Indices.html#Indices" title="Index" rel="index">Index</a>]</p>
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+<hr>
+<a name="Conditionals-with-Omitted-Operands"></a>
+<h3 class="section">6.8 Conditionals with Omitted Operands</h3>
+<a name="index-conditional-expressions_002c-extensions"></a>
+<a name="index-omitted-middle_002doperands"></a>
+<a name="index-middle_002doperands_002c-omitted"></a>
+<a name="index-extensions_002c-_003f_003a"></a>
+<a name="index-_003f_003a-extensions"></a>
+
+<p>The middle operand in a conditional expression may be omitted.  Then
+if the first operand is nonzero, its value is the value of the conditional
+expression.
+</p>
+<p>Therefore, the expression
+</p>
+<div class="smallexample">
+<pre class="smallexample">x ? : y
+</pre></div>
+
+<p>has the value of <code>x</code> if that is nonzero; otherwise, the value of
+<code>y</code>.
+</p>
+<p>This example is perfectly equivalent to
+</p>
+<div class="smallexample">
+<pre class="smallexample">x ? x : y
+</pre></div>
+
+<a name="index-side-effect-in-_003f_003a"></a>
+<a name="index-_003f_003a-side-effect"></a>
+<p>In this simple case, the ability to omit the middle operand is not
+especially useful.  When it becomes useful is when the first operand does,
+or may (if it is a macro argument), contain a side effect.  Then repeating
+the operand in the middle would perform the side effect twice.  Omitting
+the middle operand uses the value already computed without the undesirable
+effects of recomputing it.
+</p>
+
+
+
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