74 lines
3.8 KiB
HTML
74 lines
3.8 KiB
HTML
<?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 name="DC.Type" content="task" />
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<meta name="DC.Title" content="Data type errors" />
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<meta name="abstract" content="This details other types of data type errors that may occur." />
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<meta name="description" content="This details other types of data type errors that may occur." />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Data type errors</title>
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</head>
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<body id="dataerror"><a name="dataerror"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Data type errors</h1>
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<div><p>This details other types of data type errors that may occur.</p>
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<div class="section"> <p>When passing a value, the data type (TYPE parameter) must be
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the same (*CHAR, *DEC, or *LGL) in the calling procedure or program and in
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the called procedure or program. Errors frequently occur in this area when
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you attempt to pass a numeric constant. If the numeric constant is enclosed
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in apostrophes, it is passed as a character string. However, if the constant
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is not enclosed in apostrophes, it is passed as a packed numeric field with
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LEN(15 5).</p>
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<div class="p">In the following example, a quoted numeric value is passed
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to a program that expects a decimal value. A decimal data error (escape message
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MCH1202) occurs when variable &A is referred to in the called program
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(PGMA): <pre>CALL PGMA PARM('123') /* CALLING PROGRAM */
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PGM PARM(&A) /* PGMA */
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DCL &A *DEC LEN(15 5) /* DEFAULT LENGTH */
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.
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.
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.
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IF (&A *GT 0) THEN(...) /* MCH1202 OCCURS HERE */</pre>
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</div>
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<p>In the following example, a decimal value is passed to
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a program defining a character variable. Generally, this error does not cause
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run-time failures, but incorrect results are common: </p>
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<pre>CALL PGMB PARM(12345678) /* CALLING PROG */
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PGM PARM(&A) /* PGMB */
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DCL &A *CHAR 8
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.
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.
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.
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ENDPGM</pre>
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<p>Variable &A in PGMB has a value of hex <samp class="codeph">001234567800000F</samp>.</p>
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<p>Generally,
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data can be passed from a logical (*LGL) variable to a character (*CHAR) variable,
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and vice versa, without error, so long as the value is expressed as '0' or
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'1'.</p>
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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="comer.htm" title="This describes the errors encountered most frequently in passing values on a CALL command or a CALLPRC command. Some of these errors can be very difficult to debug, and some have serious consequences for program functions.">Common errors when calling programs and procedures</a></div>
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</div>
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</div>
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</body>
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</html> |