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<a name="Subranges"></a>
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Next: <a href="Arrays.html#Arrays" accesskey="n" rel="next">Arrays</a>, Previous: <a href="Cross_002dReferences.html#Cross_002dReferences" accesskey="p" rel="prev">Cross-References</a>, Up: <a href="Types.html#Types" accesskey="u" rel="up">Types</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Symbol-Types-Index.html#Symbol-Types-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
<a name="Subrange-Types"></a>
<h3 class="section">5.4 Subrange Types</h3>

<p>The &lsquo;<samp>r</samp>&rsquo; type descriptor defines a type as a subrange of another
type.  It is followed by type information for the type of which it is a
subrange, a semicolon, an integral lower bound, a semicolon, an
integral upper bound, and a semicolon.  The AIX documentation does not
specify the trailing semicolon, in an effort to specify array indexes
more cleanly, but a subrange which is not an array index has always
included a trailing semicolon (see <a href="Arrays.html#Arrays">Arrays</a>).
</p>
<p>Instead of an integer, either bound can be one of the following:
</p>
<dl compact="compact">
<dt><code>A <var>offset</var></code></dt>
<dd><p>The bound is passed by reference on the stack at offset <var>offset</var>
from the argument list.  See <a href="Parameters.html#Parameters">Parameters</a>, for more information on such
offsets.
</p>
</dd>
<dt><code>T <var>offset</var></code></dt>
<dd><p>The bound is passed by value on the stack at offset <var>offset</var> from
the argument list.
</p>
</dd>
<dt><code>a <var>register-number</var></code></dt>
<dd><p>The bound is passed by reference in register number
<var>register-number</var>.
</p>
</dd>
<dt><code>t <var>register-number</var></code></dt>
<dd><p>The bound is passed by value in register number <var>register-number</var>.
</p>
</dd>
<dt><code>J</code></dt>
<dd><p>There is no bound.
</p></dd>
</dl>

<p>Subranges are also used for builtin types; see <a href="Traditional-Builtin-Types.html#Traditional-Builtin-Types">Traditional Builtin Types</a>.
</p>


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