80 lines
5.4 KiB
HTML
80 lines
5.4 KiB
HTML
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<title>DO command and DO groups</title>
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</head>
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<body id="docmd"><a name="docmd"><!-- --></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">DO command and DO groups</h1>
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<div><p>The DO command allows you to process a group of commands together. </p>
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<div class="section"><p>The group is defined as all those commands between the DO command
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and the corresponding <span class="cmdname">End Do Group (ENDDO)</span> command.</p>
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<p>Processing
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of the group is usually conditioned on the evaluation of an associated
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command. Do groups are most frequently associated with the IF, ELSE, or MONMSG
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commands. For instance:</p>
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<div class="fignone"><br /><img src="rv2w272.gif" alt="Processing of the group is usually conditioned on the evaluation of an associated command. Do groups are most frequently associated with the IF, ELSE, or MONMSG commands." /><br /></div>
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<p>If the logical expression <samp class="codeph">(&A=&B)</samp> is true,
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then the Do group is processed. If the expression is not true, then processing
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starts after the ENDDO command; the Do group is skipped.</p>
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<p>In the following
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procedure, if &A is not equal to &B, the system calls PROCB. PROCA
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is not called, nor are any other commands in the Do group processed.</p>
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<div class="fignone"><br /><img src="rv3w198.gif" alt="In the following procedure, if &A is not equal to &B, the system calls PROCB. PROCA is not called, nor are any other commands in the Do group processed." /><br /></div>
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<p>Do groups can be nested within other Do groups, up to a maximum of
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25 levels of nesting.</p>
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<p>There are three levels of nesting in the following
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example. Note how each Do group is completed by an <span class="cmdname">End Do Group
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(ENDDO)</span> command.</p>
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<div class="fignone"><br /><img src="rv3w199.gif" alt="There are three levels of nesting in this following example. Note how each Do group is completed by an ENDDO command." /><br /></div>
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<p>In this example, if &A in the first nest does not equal 5, PGMC
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is called. If &A does equal 5, the statements in the second Do group
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are processed. If &AREA in the second Do group does not equal YES, procedure
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ACCTSPAY is called, because processing moves to the next command after the
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Do group.</p>
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<p>The CL compiler does not indicate the beginning or ending
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of Do groups. If the CL compiler notes any unbalanced conditions, it is not
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easy to detect the actual errors.</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="contp.htm" title="You can use commands to change the flow of logic within your CL procedure.">Control processing within a CL procedure</a></div>
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</div>
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<div class="relref"><strong>Related reference</strong><br />
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<div><a href="ifcmd.htm" title="The IF command is used to state a condition that, if true, specifies some statement or group of statements in the procedure to be run.">IF command</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="../clfinder/finder.htm">CL command finder</a></div>
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<div><a href="../cl/do.htm">Do Group (DO) command</a></div>
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</div>
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</div>
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</body>
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