49 lines
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49 lines
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<!-- Common Lisp HyperSpec (TM), version 7.0 generated by Kent M. Pitman on Mon, 11-Apr-2005 2:31am EDT -->
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<TITLE>CLHS: Section 6.1.4.3</TITLE>
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<H1><A REV=MADE HREF="http://www.lispworks.com/"><IMG WIDTH=80 HEIGHT=65 ALT="[LISPWORKS]" SRC="../Graphics/LWSmall.gif" ALIGN=Bottom></A><A REL=TOP HREF="../Front/index.htm"><IMG WIDTH=237 HEIGHT=65 ALT="[Common Lisp HyperSpec (TM)]" SRC="../Graphics/CLHS_Sm.gif" ALIGN=Bottom></A> <A REL=PREV HREF="06_adb.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Previous]" SRC="../Graphics/Prev.gif" ALIGN=Bottom></A><A REL=UP HREF="06_ad.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Up]" SRC="../Graphics/Up.gif" ALIGN=Bottom></A><A REL=NEXT HREF="06_ae.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Next]" SRC="../Graphics/Next.gif" ALIGN=Bottom></A></H1>
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<H2>
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6.1.4.3 Examples of WHILE and UNTIL clauses</H2> <P>
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<PRE>
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(loop while (hungry-p) do (eat))
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;; UNTIL NOT is equivalent to WHILE.
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(loop until (not (hungry-p)) do (eat))
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;; Collect the length and the items of STACK.
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(let ((stack '(a b c d e f)))
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(loop for item = (length stack) then (pop stack)
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collect item
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while stack))
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=> (6 A B C D E F)
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;; Use WHILE to terminate a loop that otherwise wouldn't terminate.
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;; Note that WHILE occurs after the WHEN.
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(loop for i fixnum from 3
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when (oddp i) collect i
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while (< i 5))
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=> (3 5)
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</PRE>
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