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HTML
184 lines
10 KiB
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<meta name="DC.Title" content="Change the value of a variable" />
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<meta name="abstract" content="You can change the value of a CL variable using the Change Variable (CHGVAR) command." />
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Change the value of a variable</title>
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</head>
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<body id="valuv"><a name="valuv"><!-- --></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">Change the value of a variable</h1>
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<div><p>You can change the value of a CL variable using the <span class="cmdname">Change
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Variable (CHGVAR)</span> command. </p>
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<div class="section"> <p>The value can be changed: </p>
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<ul><li>To a constant, shown in this example: <pre>CHGVAR VAR(&INVCMPLT) VALUE(0)</pre>
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<p>&INVCMPLT is set to 0.</p>
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<p>You could also use this notation:</p>
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<pre>CHGVAR &INVCMPLT 0</pre>
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</li>
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<li>To the value of another variable, shown in this example: <pre>CHGVAR VAR(&A) VALUE(&B)</pre>
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<p>&A is set to the value of the variable &B</p>
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<p>You
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could also use this notation</p>
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<pre>CHGVAR &A &B</pre>
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</li>
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<li>To the value of an expression after it is evaluated, shown in the following
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example: <pre>CHGVAR VAR(&A) VALUE(&A + 1)</pre>
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<p>The value of &A is increased by 1.</p>
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<p>You could also
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use this notation:</p>
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<pre>CHGVAR &A (&A + 1)</pre>
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</li>
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<li>To the value produced by the built-in function %SST, shown in the following
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example: <pre>CHGVAR VAR(&A) VALUE(%SST(&B 1 5))</pre>
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<p>&A is set to the first five characters of the value of
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the variable &B</p>
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</li>
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<li>To the value produced by the built-in function %SWITCH, shown in the following
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example: <pre>CHGVAR VAR(&A) VALUE(%SWITCH(0XX111X0))</pre>
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<p>&A is set to 1 if job switches 1 and 8 are 0 and job switches
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4, 5 and 6 are 1; otherwise, &A is set to 0.</p>
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</li>
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<li>To the value produced by the built-in function %BIN: <pre>CHGVAR VAR(&A) VALUE(%BIN((%B 1 4))</pre>
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<p>The first four characters of variable &B are converted
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to the decimal equivalent and stored in variable &A.</p>
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</li>
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</ul>
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<p>The CHGVAR command can be used to retrieve and to change the local
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data area also. For example, the following commands blank out 10 bytes of
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the local data area and retrieve part of the local data area: </p>
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<pre>CHGVAR %SST(*LDA 1 10) ' '
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CHGVAR &A %SST(*LDA 1 10)</pre>
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<p>The following table shows valid assignments to variables from
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values (literals or variables).</p>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" frame="border" border="1" rules="all"><caption>Table 1. Valid assignments to variables
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from values</caption><thead align="left"><tr><th align="left" valign="bottom" id="d0e132"> </th>
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<th align="left" valign="bottom" id="d0e133">Logical Value</th>
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<th align="left" valign="bottom" id="d0e135">Character Value</th>
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<th align="left" valign="bottom" id="d0e137">Decimal Value</th>
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<th align="left" valign="bottom" id="d0e139">Signed Integer Value</th>
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<th align="left" valign="bottom" id="d0e141">Unsigned Integer Value</th>
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</tr>
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</thead>
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<tbody><tr><td valign="top" headers="d0e132 "><strong>Logical Variable</strong></td>
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<td valign="top" headers="d0e133 ">X</td>
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<td valign="top" headers="d0e135 "> </td>
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<td valign="top" headers="d0e137 "> </td>
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<td valign="top" headers="d0e139 "> </td>
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<td valign="top" headers="d0e141 "> </td>
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</tr>
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<tr><td valign="top" headers="d0e132 "><strong>Character Variable</strong></td>
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<td valign="top" headers="d0e133 ">X</td>
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<td valign="top" headers="d0e135 ">X</td>
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<td valign="top" headers="d0e137 ">X</td>
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<td valign="top" headers="d0e139 ">X</td>
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<td valign="top" headers="d0e141 ">X</td>
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</tr>
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<tr><td valign="top" headers="d0e132 "><strong>Decimal Variable</strong></td>
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<td valign="top" headers="d0e133 "> </td>
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<td valign="top" headers="d0e135 ">X</td>
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<td valign="top" headers="d0e137 ">X</td>
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<td valign="top" headers="d0e139 ">X</td>
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<td valign="top" headers="d0e141 ">X</td>
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</tr>
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<tr><td valign="top" headers="d0e132 "><strong>Signed Integer Variable</strong></td>
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<td valign="top" headers="d0e133 "> </td>
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<td valign="top" headers="d0e135 ">X</td>
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<td valign="top" headers="d0e137 ">X</td>
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<td valign="top" headers="d0e139 ">X</td>
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<td valign="top" headers="d0e141 ">X</td>
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</tr>
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<tr><td valign="top" headers="d0e132 "><strong>Unsigned Integer Variable</strong></td>
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<td valign="top" headers="d0e133 "> </td>
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<td valign="top" headers="d0e135 ">X</td>
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<td valign="top" headers="d0e137 ">X</td>
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<td valign="top" headers="d0e139 ">X</td>
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<td valign="top" headers="d0e141 ">X</td>
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</tr>
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</tbody>
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</table>
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</div>
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<div class="note"><span class="notetitle">Note:</span> <ol><li> <p>When specifying a numeric value for a character variable, remember
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the following: </p>
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<ul><li>The value of the character variable is right-justified and, if necessary,
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padded with leading zeros.</li>
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<li>The character variable must be long enough to contain a decimal point
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and a minus (-) sign, when necessary.</li>
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<li>When used, a minus (-) sign is placed in the leftmost position of the
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value.</li>
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</ul>
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<p>For example, &A is a character variable to be changed to the value
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of the decimal variable &B. The length of &A is 6. The length and
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decimal positions of &B are 5 and 2, respectively. The current value
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of &B is <samp class="codeph">123</samp>. The resulting value of &A is <samp class="codeph">123.00</samp>.</p>
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</li>
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<li> <p>When specifying a character value for a numeric variable, remember
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the following: </p>
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<ul><li>The decimal point is determined by the placement of a decimal point in
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the character value. If the character value does not contain a decimal point,
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the decimal point is placed in the rightmost position of the value.</li>
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<li>The character value can contain a minus (-) sign or plus (+) sign immediately
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to the left of the value; no intervening blanks are allowed. If the character
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value has no sign, the value is assumed to be positive.</li>
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<li>If the character value contains more digits to the right of the decimal
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point than can be contained in the numeric variable, the digits are truncated
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if it's a decimal variable, or rounded if it's an integer variable. If the
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excess digits are to the left of the decimal point, they are not truncated
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and an error occurs. <p>For example, &C is a decimal variable to be changed
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to the value of the character variable &D The length of &C is 5 with
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2 decimal positions. The length of &D is 10 and its current value is
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+123.1bbbb (where b=blank). The resulting value of &C is <samp class="codeph">123.10</samp>.</p>
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</li>
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</ul>
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</li>
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</ol>
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</div>
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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="relref"><strong>Related reference</strong><br />
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<div><a href="rbam6addr.htm" title="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.">%ADDRESS built-in function</a></div>
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<div><a href="rbam6offset.htm" title="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.">%OFFSET built-in function</a></div>
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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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<div><a href="switc.htm" title="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'.">%SWITCH built-in function</a></div>
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<div><a href="binar.htm" title="The binary built-in function (%BINARY or %BIN) interprets the contents of a specified CL character variable as a signed binary integer.">%BINARY built-in function</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/chgvar.htm">Change Variable (CHGVAR) 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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