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<meta name="DC.Title" content="Example 2: Define fields derived from existing field definitions" />
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<title>Example 2: Define fields derived from existing field definitions</title>
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<h1 class="topictitle1">Example 2: Define fields derived from existing field definitions</h1>
<div><p>This example shows the use of built-in functions.</p>
<div class="section"><p>Assume that you want to calculate a mathematical
function that is the sine of the <em>Fldm</em> field in FILEA. First create
a file (assume it is called FILEAA) with a record format containing the following
fields:</p>
</div>
<table cellpadding="4" cellspacing="0" border="1" class="tableborder"><tr><td>
<table cellpadding="4" cellspacing="0" summary="" width="100%" border="0"><thead align="left"><tr><th align="left" valign="bottom" width="50%" id="d0e27">FILEA</th>
<th align="left" valign="bottom" width="50%" id="d0e29">FILEAA</th>
</tr>
</thead>
<tbody><tr><td align="left" valign="top" width="50%" headers="d0e27 ">Code</td>
<td align="left" valign="top" width="50%" headers="d0e29 ">Code</td>
</tr>
<tr><td align="left" valign="top" width="50%" headers="d0e27 ">Fldm</td>
<td align="left" valign="top" width="50%" headers="d0e29 ">Fldm</td>
</tr>
<tr><td align="left" valign="top" width="50%" headers="d0e27 "> </td>
<td align="left" valign="top" width="50%" headers="d0e29 ">Sinm</td>
</tr>
</tbody>
</table>
</td></tr></table>
<div class="section"><div class="p">You can then create a program (assume PGMF) using FILEAA as input
and specify: <pre>OVRDBF FILE(FILEAA) TOFILE(FILEA) SHARE(*YES)
OPNQRYF FILE(FILEA) FORMAT(FILEAA) +
MAPFLD((SINM '%SIN(FLDM)'))
CALL PGM(PGMF) /* Created using file FILEAA as input */
CLOF OPNID(FILEA)
DLTOVR FILE(FILEAA)</pre>
</div>
</div>
<div class="section"><p>The built-in function %SIN calculates the sine of the field specified
as its argument. Because the <em>Sinm</em> field is defined in the format specified
on the FORMAT parameter, the Open Query File (OPNQRYF) command converts its
internal definition of the sine value (in floating point) to the definition
of the <em>Sinm</em> field. This technique can be used to avoid certain high-level
language restrictions regarding the use of floating-point fields. For example,
if you defined the <em>Sinm</em> field as a packed decimal field, PGMF can be
written using any high-level language, even though the value was built using
a floating-point field.</p>
</div>
<div class="section"><p>There are many other functions besides sine that can be used.
See the OPNQRYF command in the Control language (CL) topic for a complete
list of built-in functions.</p>
</div>
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<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="rbafofdefd.htm" title="Listed here are the operations allowed by defining fields derived from existing field definitions.">Define fields derived from existing field definitions</a></div>
</div>
<div class="relconcepts"><strong>Related concepts</strong><br />
<div><a href="../rbam6/rbam6clmain.htm">Control language (CL)</a></div>
</div>
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