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<title>Control processing within a CL procedure</title>
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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">Control processing within a CL procedure</h1>
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<div><p>You can use commands to change the flow of logic within your CL
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procedure.</p>
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<div class="section"><p>Commands in a CL procedure are processed in consecutive sequence.
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Each command is processed, one after another, in the sequence in which it
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is encountered. You can alter this consecutive processing using commands
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that change the flow of logic in the procedure. These commands can be conditional
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or unconditional.</p>
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<p>Unconditional branching means that you can instruct
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processing to branch to commands or sets of commands located anywhere in the
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procedure without regard to what conditions exist at the time the branch instruction
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is processed. Unconditional processing commands include: </p>
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<ul><li>GOTO</li>
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<li>ITERATE</li>
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<li>LEAVE</li>
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<li>CALLSUBR</li>
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</ul>
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<p>Conditional branching means that under certain specified conditions,
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processing may branch to sections or commands that are not consecutive within
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the procedure. The branching may be to any statement in the procedure. This
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is called conditional processing because the branching only occurs
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when the specified condition is true. Conditional processing is usually associated
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with the IF command. With the ELSE command, you can specify alternative processing
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if the condition is not true.The simple DO command allows you to create groups
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of commands that are always processed together, as a group, under specified
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conditions. Conditional processing commands include: </p>
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<ul><li>IF and THEN</li>
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<li>SELECT, WHEN, and OTHERWISE</li>
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<li>DOFOR</li>
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<li>DOWHILE</li>
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<li>DOUNTIL</li>
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</ul>
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</div>
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</div>
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<div>
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<ul class="ullinks">
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<li class="ulchildlink"><strong><a href="gotoc.htm">GOTO command and labels</a></strong><br />
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The GOTO command processes an unconditional branch.</li>
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<li class="ulchildlink"><strong><a href="ifcmd.htm">IF command</a></strong><br />
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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.</li>
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<li class="ulchildlink"><strong><a href="elsec.htm">ELSE command</a></strong><br />
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The ELSE command is a way of specifying alternative processing if the condition on the associated IF command is false.</li>
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<li class="ulchildlink"><strong><a href="embif.htm">Embedded IF commands</a></strong><br />
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An IF command can be embedded in another IF command.</li>
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<li class="ulchildlink"><strong><a href="docmd.htm">DO command and DO groups</a></strong><br />
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The DO command allows you to process a group of commands together.</li>
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<li class="ulchildlink"><strong><a href="dountilcmd.htm">DOUNTIL command</a></strong><br />
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The Do Until (DOUNTIL) command processes a group of CL commands one or more times.</li>
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<li class="ulchildlink"><strong><a href="dowhilecmd.htm">DOWHILE command</a></strong><br />
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The DOWHILE command lets you process a group of commands zero or more times while the value of a logical expression is true.</li>
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<li class="ulchildlink"><strong><a href="doforcmd.htm">DOFOR command</a></strong><br />
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The DOFOR command lets you process a group of commands a specified number of times.</li>
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<li class="ulchildlink"><strong><a href="iteratecmd.htm">ITERATE command</a></strong><br />
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The <span class="cmdname">Iterate (ITERATE)</span> command can be used to
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skip the remaining commands in an active DOWHILE, DOUNTIL, or DOFOR group. </li>
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<li class="ulchildlink"><strong><a href="leavecmd.htm">LEAVE command</a></strong><br />
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The <span class="cmdname">Leave (LEAVE)</span> command can be used to exit
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an active DOWHILE, DOUNTIL, or DOFOR group. </li>
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<li class="ulchildlink"><strong><a href="callsubrc.htm">CALLSUBR command</a></strong><br />
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The <span class="cmdname">Call Subroutine (CALLSUBR)</span> command is used
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in a CL procedure for passing control to a subroutine defined within the same
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procedure.</li>
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<li class="ulchildlink"><strong><a href="selectcmd.htm">SELECT command and SELECT groups</a></strong><br />
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The <span class="cmdname">Select (SELECT)</span> command is used to identify
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one or more conditions and an associated group of commands to process when
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that condition is true. </li>
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<li class="ulchildlink"><strong><a href="subrc.htm">SUBR command and Subroutines</a></strong><br />
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The <span class="cmdname">Subroutine (SUBR)</span> command is used in a CL
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procedure, along with the <span class="cmdname">End Subroutine (ENDSUBR)</span> command,
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to delimit the group of commands that define a subroutine. </li>
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<li class="ulchildlink"><strong><a href="expr.htm">*AND, *OR, and *NOT operators</a></strong><br />
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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.</li>
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<li class="ulchildlink"><strong><a href="rbam6addr.htm">%ADDRESS built-in function</a></strong><br />
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The address built-in function (%ADDRESS or %ADDR) can be used to change or test the memory address stored in a CL pointer variable and can only be used within a CL procedure.</li>
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<li class="ulchildlink"><strong><a href="binar.htm">%BINARY built-in function</a></strong><br />
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The binary built-in function (%BINARY or %BIN) interprets the contents of a specified CL character variable as a signed binary integer.</li>
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<li class="ulchildlink"><strong><a href="rbam6offset.htm">%OFFSET built-in function</a></strong><br />
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The offset built-in function (%OFFSET or %OFS) can be used to store or change the offset portion of a CL pointer variable and can only be used within a CL procedure.</li>
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<li class="ulchildlink"><strong><a href="subst.htm">%SUBSTRING built-in function</a></strong><br />
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The substring built-in function (%SUBSTRING or%SST) produces a character string that is a subset of an existing character string and can only be used within a CL procedure.</li>
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<li class="ulchildlink"><strong><a href="switc.htm">%SWITCH built-in function</a></strong><br />
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The switch built-in function (%SWITCH) compares one or more of eight switches with the eight switch settings already established for the job and returns a logical value of '0' or '1'.</li>
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<li class="ulchildlink"><strong><a href="monms.htm">Monitor Message (MONMSG) Command</a></strong><br />
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The <span class="cmdname">Monitor Message (MONMSG)</span> command is used
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to monitor for escape, notify, or status messages sent to the call stack of
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the procedure in which the <span class="cmdname">Monitor Message (MONMSG)</span> command
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is used. </li>
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</ul>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="clpro.htm" title="This provides tasks and concepts specific to CL programming.">CL programming</a></div>
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</div>
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<div class="reltasks"><strong>Related tasks</strong><br />
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<div><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="../clfinder/finder.htm">CL command finder</a></div>
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</div>
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</div>
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</body>
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