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HTML
102 lines
6.1 KiB
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<meta name="DC.Title" content="Declare a variable" />
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<meta name="abstract" content="All variables must be declared (defined) to the CL procedure before they can be used by the procedure." />
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<title>Declare a variable</title>
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<body id="declv"><a name="declv"><!-- --></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">Declare a variable</h1>
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<div><p>All variables must be declared (defined) to the CL procedure before
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they can be used by the procedure.</p>
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<div class="section"><p>There are two ways of declaring variables:</p>
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<ul><li><strong>Declare variable</strong>. Defining it is accomplished using the <span class="cmdname">Declare
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CL Variable (DCL)</span> command and consists of defining the attributes
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of the variable. These attributes include type, length, and initial value.
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<pre>DCL VAR(&AREA) TYPE(*CHAR) LEN(4) VALUE(BOOK)</pre>
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</li>
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<li><strong>Declare file</strong>. If your CL procedure uses a file, you must specify
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the name of the file in the FILE parameter on the Declare File (DCLF) command.
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The file contains a description (format) of the records in the file and the
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fields in the records. During compilation, the DCLF command implicitly declares
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CL variables for the fields and indicators defined in the file. <p>For example,
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if the DDS for the file has one record in it with two fields (F1 and F2),
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then two variables, &F1 and &F2, are automatically declared in the
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program. </p>
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<pre>DCLF FILE(MCGANN/GUIDE)</pre>
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<p>If the file is a physical file which was created
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without DDS, one variable is declared for the entire record. The variable
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has the same name as the file, and its length is the same as the record length
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of the file.</p>
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</li>
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</ul>
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<p>The declare commands must precede all other commands in the procedure
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(except the PGM command), but they can be intermixed in any order.</p>
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</div>
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<div class="section"><h4 class="sectiontitle">Declare CL Variable (DCL) command</h4><p>In its simplest
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form, the Declare CL Variable (DCL) command has the following parameters:</p>
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<div class="fignone"><br /><img src="rv2w271.gif" alt="Declare CL Variable (DCL) command has these parameters" /><br /></div>
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<p>When you use a DCL command, you must use the following rules:</p>
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<ul><li>The CL variable name must begin with an ampersand (&) followed by
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as many as 10 characters. The first character following the & must be
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alphabetic and the remaining characters alphanumeric. For example, &PART</li>
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<li>The CL variable value must be one of the following: <ul><li>A character string as long as 5000 characters.</li>
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<li>A packed decimal value totaling up to 15 digits with as many as 9 decimal
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positions.</li>
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<li>A logical value '0' or '1', where '0' can mean off, false, or no, and
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'1' can mean on, true, or yes. A logical variable must be either '0' or '1'.</li>
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<li>An integer value of two bytes or four bytes. The value can be negative
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if *INT is specified for the TYPE parameter.</li>
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<li><img src="./delta.gif" alt="Start of change" />A pointer value which can hold the location of data in storage.<img src="./deltaend.gif" alt="End of change" /></li>
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</ul>
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</li>
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<li>If you do not specify an initial value, the following is assumed: <ul><li>'0' for decimal variables</li>
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<li>Blanks for character variables</li>
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<li>'0' for logical variables.</li>
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<li>'0' for integer variables.</li>
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<li><img src="./delta.gif" alt="Start of change" />Null for pointer variables<img src="./deltaend.gif" alt="End of change" /></li>
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</ul>
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<p>For decimal and character types, if you specify an initial value and
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do not specify the LEN parameter, the default length is the same as the length
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of the initial value. For type *CHAR, if you do not specify the LEN parameter,
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the string can be as long as 5000 characters. For type *INT or *UINT, if you
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do not specify the LEN parameter, the default length is 4.</p>
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</li>
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<li>Declare the parameters as variables in the program DCL statements.</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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<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="relinfo"><strong>Related information</strong><br />
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<div><a href="../cl/dcl.htm">Declare CL Variable (DCL) command</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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