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<a name="isascii"></a>
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<p>
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Next: <a href="isblank.html#isblank" accesskey="n" rel="next">isblank</a>, Previous: <a href="isalpha.html#isalpha" accesskey="p" rel="prev">isalpha</a>, Up: <a href="Ctype.html#Ctype" accesskey="u" rel="up">Ctype</a> [<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>
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<a name="isascii_002c-isascii_005fl_002d_002d_002dASCII-character-predicate"></a>
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<h3 class="section">3.3 <code>isascii</code>, <code>isascii_l</code>—ASCII character predicate</h3>
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<a name="index-isascii"></a>
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<a name="index-isascii_005fl"></a>
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<p><strong>Synopsis</strong>
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</p><div class="example">
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<pre class="example">#include <ctype.h>
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int isascii(int <var>c</var>);
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#include <ctype.h>
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int isascii_l(int <var>c</var>, locale_t <var>locale</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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<code>isascii</code> is a macro which returns non-zero when <var>c</var> is an ASCII
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character, and 0 otherwise. It is defined for all integer values.
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</p>
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<p><code>isascii_l</code> is like <code>isascii</code> but performs the check based on the
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locale specified by the locale object locale. If <var>locale</var> is
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LC_GLOBAL_LOCALE or not a valid locale object, the behaviour is undefined.
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</p>
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<p>You can use a compiled subroutine instead of the macro definition by
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undefining the macro using ‘<code>#undef isascii</code>’ or ‘<code>#undef isascii_l</code>’.
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</p>
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<br>
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<p><strong>Returns</strong><br>
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<code>isascii</code>, <code>isascii_l</code> return non-zero if the low order byte of <var>c</var>
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is in the range 0 to 127 (<code>0x00</code>–<code>0x7F</code>).
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</p>
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<br>
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<p><strong>Portability</strong><br>
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<code>isascii</code> is ANSI C.
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<code>isascii_l</code> is a GNU extension.
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</p>
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<p>No supporting OS subroutines are required.
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</p>
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<br>
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