87 lines
5.3 KiB
HTML
87 lines
5.3 KiB
HTML
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<meta name="abstract" content="The DOWHILE command lets you process a group of commands zero or more times while the value of a logical expression is true." />
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<title>DOWHILE command</title>
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</head>
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<body id="dowhilecmd"><a name="dowhilecmd"><!-- --></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">DOWHILE command</h1>
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<div><p>The DOWHILE command lets you process a group of commands zero or
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more times while the value of a logical expression is true. </p>
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<div class="section"><p>The <span class="cmdname">Do While (DOWHILE)</span> command is used to state
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a condition that, if true, specifies a command or group of commands in the
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procedure to run. The group of commands is defined as those commands between
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the <span class="cmdname">Do While (DOWHILE)</span> and the matching <span class="cmdname">End DO
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(ENDDO)</span> command.</p>
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<p>After the group of commands is processed,
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the stated condition is evaluated. If the condition is false, the DOWHILE
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group will be exited and processing will resume with the next command following
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the associated ENDDO. If the condition is true, the group will continue processing
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with the first command in the group. When the ENDDO command is reached, control
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returns to the DOWHILE command to again evaluate the condition.</p>
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<p>The
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logical expression on the COND parameter may be a single logical variable
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or constant, or it must describe a relationship between two or more operands;
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the expression is then evaluated as true or false.</p>
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<p>The following is
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an example of conditional processing with a <span class="cmdname">Do While (DOWHILE)</span> command.</p>
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<pre>DOWHILE (&LGL)
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.
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.
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.
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IF (&INT *EQ 2) (CHGVAR &LGL '0')
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ENDDO</pre>
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<p>When the DOWHILE group is processed, the stated condition will
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be evaluated. If the condition is true, the group of commands in the DOWHILE
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group is processed. If the condition is false, processing continues with
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the command following the associated ENDDO command.</p>
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<p>If the value of &LGL
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is true, the commands in the DOWHILE group will be run until &INT is equal
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to 2 causing the &LGL variable value to be set to false.</p>
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<p>The <span class="cmdname">Leave
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(LEAVE)</span> command may be used to exit the DOWHILE group and resume
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processing following the ENDDO. The ITERATE command may be used to skip the
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remaining commands in the group and evaluate the stated condition immediately.</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="expr.htm" title="The logical operators *AND and *OR specify the relationship between operands in a logical expression. The logical operator *NOT is used to negate logical variables or constants.">*AND, *OR, and *NOT operators</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/dowhile.htm">Do While (DOWHILE) command</a></div>
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</div>
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</div>
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