68 lines
3.8 KiB
HTML
68 lines
3.8 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<meta name="DC.Type" content="reference" />
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<meta name="DC.Title" content="Use based variables" />
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<meta name="abstract" content="Based variables can be used to map variables passed to the program or manipulate arrays of values." />
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<meta name="description" content="Based variables can be used to map variables passed to the program or manipulate arrays of values." />
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<meta name="DC.subject" content="based, variable, basing, description" />
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<meta name="keywords" content="based, variable, basing, description" />
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<meta name="DC.Relation" scheme="URI" content="workv.htm" />
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<meta name="DC.Relation" scheme="URI" content="../cl/dcl.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 1998, 2006" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Use based variables</title>
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</head>
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<body id="basedv"><a name="basedv"><!-- --></a>
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<img src="./delta.gif" alt="Start of change" /><!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Use based variables</h1>
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<div><p>Based variables can be used to map variables passed to the program
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or manipulate arrays of values.</p>
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<div class="section"><p>The basing pointer must be set using the ADDRESS keyword on the
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Declare (DCL Command) or with the %ADDRESS built-in function before being
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used. After the basing pointer is set, the variables will work like local
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variables.</p>
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<p>In the following example, the basing pointer &PTR is
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declared to be equal to the address of &AUTO. The variable &BASED
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then has the value of the first 10 bytes addressed by the pointer variable &PTR.
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Later in the procedure, the value of variable &BASED is
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checked for equality against the first 10 bytes of variable &AUTO. If
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the values are the same, meaning pointer &PTR addresses the first byte
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of &AUTO, the pointer offset is changed to address byte 11 of variable &AUTO.
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Now variable &BASED has a value equal to bytes 11-20 of variable &AUTO.</p>
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<pre>PGM
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DCL &AUTO *CHAR 20
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DCL &PTR *PTR ADDRESS(&AUTO)
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DCL &BASED *CHAR 10 STG(*BASED) BASPTR(&PTR)
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:
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IF COND(%SST(&AUTO 1 10) *EQ &BASED) +
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THEN(CHGVAR %OFS(&PTR) (%OFS(&PTR) + 10))
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:
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ENDPGM</pre>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="workv.htm" title="CL procedures consist of CL commands, and the commands themselves consist of the command statement, parameters, and parameter values.">Use variables</a></div>
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</div>
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<div class="relinfo"><strong>Related information</strong><br />
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<div><a href="../cl/dcl.htm">Declare CL Variable (DCL) command</a></div>
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</div>
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</div>
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<img src="./deltaend.gif" alt="End of change" /></body>
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</html>
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