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<a name="isalpha"></a>
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<p>
Next: <a href="isascii.html#isascii" accesskey="n" rel="next">isascii</a>, Previous: <a href="isalnum.html#isalnum" accesskey="p" rel="prev">isalnum</a>, Up: <a href="Ctype.html#Ctype" accesskey="u" rel="up">Ctype</a> &nbsp; [<a href="Document-Index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Document-Index.html#Document-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
<a name="isalpha_002d_002d_002dalphabetic-character-predicate"></a>
<h3 class="section">3.2 <code>isalpha</code>&mdash;alphabetic character predicate</h3>
<a name="index-isalpha"></a>
<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">#include &lt;ctype.h&gt;
int isalpha(int <var>c</var>);

</pre></div>
<p><strong>Description</strong><br>
<code>isalpha</code> is a macro which classifies ASCII integer values by table
lookup.  It is a predicate returning non-zero when <var>c</var> represents an
alphabetic ASCII character, and 0 otherwise.  It is defined only if
<var>c</var> is representable as an unsigned char or if <var>c</var> is EOF.
</p>
<p>You can use a compiled subroutine instead of the macro definition by
undefining the macro using &lsquo;<code>#undef isalpha</code>&rsquo;.
</p>
<br>
<p><strong>Returns</strong><br>
<code>isalpha</code> returns non-zero if <var>c</var> is a letter (<code>A</code>&ndash;<code>Z</code> or
<code>a</code>&ndash;<code>z</code>). 
</p>
<br>
<p><strong>Portability</strong><br>
<code>isalpha</code> is ANSI C.
</p>
<p>No supporting OS subroutines are required.
</p>
<br>




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