http://wiki.signature.net/index.php?action=history&feed=atom&title=IB_Statements%2Fprev 2026-05-13T01:52:35Z Revision history for this page on the wiki MediaWiki 1.16.0 http://wiki.signature.net/index.php?title=IB_Statements/prev&diff=455&oldid=prev 2009-05-22T12:11:34Z

<p>New page: &#39;&#39;&#39;PREV function&#39;&#39;&#39; &#39;&#39;&#39;Syntax:&#39;&#39;&#39; PREV(lun [,EXCP=statement-label]) &#39;&#39;&#39;Discussion:&#39;&#39;&#39; The PREV function returns the value of the key immediately previous to the current file pointer...</p> <p><b>New page</b></p><div>'''PREV function''' <br /> <br /> '''Syntax:''' PREV(lun [,EXCP=statement-label]) <br /> <br /> '''Discussion:''' The PREV function returns the value of the key immediately previous to the current file pointer file attached to the specified logical unit number. This feature provides a method for a program to read backwards through a keyed file. (See the FILE statement for another method to read backwards through a keyed file.) <br /> <br /> The PREV function does not move the record pointer in the file. To move the record pointer, you must use input/output statements such as READ and WRITE. <br /> <br /> Other file-related functions: FIRST, KEY, LAST. <br /> <br /> '''Example:''' VALUE$ = PREV(1) ! Get previous key in logical unit number 1</div>

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