105 lines
5.4 KiB
HTML
105 lines
5.4 KiB
HTML
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<meta name="DC.Title" content="Use REXX for simple lists" />
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<meta name="abstract" content="This describes the format in which elements in a simple list are passed when a command is run using REXX." />
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<meta name="description" content="This describes the format in which elements in a simple list are passed when a command is run using REXX." />
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<title>Use REXX for simple lists</title>
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</head>
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<body id="slrx"><a name="slrx"><!-- --></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">Use REXX for simple lists</h1>
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<div><p>This describes the format in which elements in a simple list are
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passed when a command is run using REXX.</p>
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<div class="section"> <div class="p">When the same command is run, the elements in a simple list are
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passed to the REXX procedure in the argument string in the following format
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where <samp class="codeph">valueN</samp> is the last value in the simple list.: <pre> . . . USER(value1 value2
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. . . valueN) . . .</pre>
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</div>
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<p>For example, if two user names (BJONES and TBROWN) are
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specified for the USER parameter, the following is passed: </p>
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<pre> . . . USER(BJONES
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TBROWN) . . .</pre>
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<p>When a simple list is passed, only the number of elements specified
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on the command are passed. Therefore, when the CPP processes a simple list,
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it uses the number of elements passed to determine how many elements can be
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processed.</p>
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<p>The REXX example below produces the same result as the CL
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procedure in <a href="crtcmdex.htm">Example: Create a command</a>:</p>
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<div class="fignone" id="slrx__samecl"><a name="slrx__samecl"><!-- --></a><span class="figcap">Figure 1. REXX
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Simple List Example</span><pre> .
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.
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.
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PARSE ARG . 'USER(' user ')' .
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.
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.
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CT = WORDS(user)
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IF CT > 0 THEN user1 = WORD(user,1) else user1 = '
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IF CT > 1 THEN user2 = WORD(user,2) else user2 = '
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IF CT > 2 THEN user3 = WORD(user,3) else user3 = '
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IF CT > 3 THEN user4 = WORD(user,4) else user4 = '
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IF CT > 4 THEN user5 = WORD(user,5) else user5 = '
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IF CT > 5 THEN
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DO
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/* If CT is greater than 5, the values passed
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is greater than the program expects, and error
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logic should be performed */
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.
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.
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.
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END
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ELSE
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DO
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/* The correct number of values are passed
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and the program can continue processing */
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END
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EXIT</pre>
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</div>
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<p>This same procedure can be used to process other lists in a REXX
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program.</p>
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<p>For a simple list, a single value such as *ALL or *NONE can
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be entered on the command instead of the list. Single values are passed as
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an individual value. Similarly, if no values are specified for a parameter,
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the default value, if any is defined, is passed as the only value in the list.
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For example, if the default value *ALL is used for the USER parameter, the
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following is passed: </p>
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<pre> . . . USER(*ALL) . . .</pre>
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<p>If no default value is defined for an optional simple list
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parameter, the following is passed: </p>
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<pre> . . . USER() . . .</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="dslst.htm" title="A simple list can accept one or more values of the type specified by the parameter.">Define a simple list</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="../books/sc415728.pdf" target="_blank">REXX/400 Programmer's Guide PDF</a></div>
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<div><a href="../books/sc415729.pdf" target="_blank">REXX/400 Reference PDF</a></div>
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</div>
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</div>
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</body>
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</html>
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