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<a name="strcasecmp_002d_002d_002dcase_002dinsensitive-character-string-compare"></a>
<h3 class="section">5.18 <code>strcasecmp</code>&mdash;case-insensitive character string compare</h3>
<a name="index-strcasecmp"></a>
<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">#include &lt;strings.h&gt;
int strcasecmp(const char *<var>a</var>, const char *<var>b</var>);

</pre></div>
<p><strong>Description</strong><br>
<code>strcasecmp</code> compares the string at <var>a</var> to
the string at <var>b</var> in a case-insensitive manner.
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<br>
<p><strong>Returns</strong><br>
</p>
<p>If <code>*<var>a</var></code> sorts lexicographically after <code>*<var>b</var></code> (after
both are converted to lowercase), <code>strcasecmp</code> returns a
number greater than zero.  If the two strings match,
<code>strcasecmp</code> returns zero.  If <code>*<var>a</var></code> sorts
lexicographically before <code>*<var>b</var></code>, <code>strcasecmp</code> returns a
number less than zero.
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<p><strong>Portability</strong><br>
<code>strcasecmp</code> is in the Berkeley Software Distribution.
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<p><code>strcasecmp</code> requires no supporting OS subroutines. It uses
tolower() from elsewhere in this library.
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