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93 lines
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<title>Specify a list or qualified name using a variable</title>
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<body id="usvar"><a name="usvar"><!-- --></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">Specify a list or qualified name using a variable</h1>
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<div><p>Variables can be used to specify a list or qualified name.</p>
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<div class="section"> <p>The value on a parameter may be a list. For example, the <span class="cmdname">Change
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Library List (CHGLIBL)</span> command requires a list of libraries on the
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LIBL parameter, each separated by blanks. The elements in this list can be
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variables: </p>
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<pre>CHGLIBL LIBL(&LIB1 &LIB2 &LIB3)</pre>
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<p>When variables are used to specify elements in a list, each
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element must be declared separately: </p>
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<pre>DCL VAR(&LIB1) TYPE(*CHAR) LEN(10) VALUE(QTEMP)
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DCL VAR(&LIB2) TYPE(*CHAR) LEN(10) VALUE(QGPL)
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DCL VAR(&LIB3) TYPE(*CHAR) LEN(10) VALUE(DISTLIB)
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CHGLIBL LIBL(&LIB1 &LIB2 &LIB3)</pre>
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<p>Variable elements cannot be specified in a list as a character
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string:</p>
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<div class="p"><strong>Incorrect:</strong> <pre>DCL VAR(&LIBS) TYPE(*CHAR) LEN(20) +
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VALUE('QTEMP QGPL DISTLIB')
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CHGLIBL LIBL(&LIBS)</pre>
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</div>
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<p>When presented as a single character string, the system
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does not view the list as a list of separate elements, and an error will occur.</p>
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<div class="p">You
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can also use variables to specify a qualified name, if each qualifier is declared
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as a separate variable: <pre>DCL VAR(&PGM) TYPE(*CHAR) LEN(10)
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DCL VAR(&LIB) TYPE(*CHAR) LEN(10)
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CHGVAR VAR(&PGM) VALUE(MYPGM)
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CHGVAR VAR(&LIB) VALUE(MYLIB)
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.
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.
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.
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DLTPGM PGM(&LIB/&PGM)
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ENDPGM</pre>
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</div>
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<p>In this example, the program and library name are declared
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separately. The program and library name cannot be specified in one variable,
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as in the following example:</p>
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<p><strong>Incorrect:</strong> </p>
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<pre>DCL VAR(&PGM) TYPE(*CHAR) LEN(11)
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CHGVAR VAR(&PGM) VALUE('MYLIB/MYPGM')
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DLTPGM PGM(&PGM)</pre>
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<p>Here again the value is viewed by the system as a single character
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string, not as two objects (a library and an object). If a qualified name
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must be handled as a single variable with a character string value, you can
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use the built-in function %SUBSTRING and the *TCAT concatenation function
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to assign object and library names to separate variables.</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="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="reltasks"><strong>Related tasks</strong><br />
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<div><a href="defcm.htm" title="This describes how you can define and create your own commands.">Define commands</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="subst.htm" title="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.">%SUBSTRING built-in function</a></div>
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