64 lines
1.9 KiB
HTML
64 lines
1.9 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3O//DTD W3 HTML 2.0//EN">
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<!Originally converted to HTML using LaTeX2HTML 95 (Thu Jan 19 1995) by Nikos Drakos (nikos@cbl.leeds.ac.uk), CBLU, University of Leeds >
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<HEAD>
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<TITLE> y-or-n-p, yes-or-no-p (PREDICATES)</TITLE>
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</HEAD>
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<BODY>
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<meta name="description" value=" y-or-n-p, yes-or-no-p (PREDICATES)">
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<meta name="keywords" value="lp">
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<meta name="resource-type" value="document">
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<meta name="distribution" value="global">
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<P>
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<BR> <HR>
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<A HREF="node116.html"><IMG ALIGN=BOTTOM ALT="next" SRC="next_motif.gif"></A>
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<A HREF="node72.html"><IMG ALIGN=BOTTOM ALT="up" SRC="up_motif.gif"></A>
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<A HREF="node114.html"><IMG ALIGN=BOTTOM ALT="previous" SRC="previous_motif.gif"></A> <BR>
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<A HREF="lp.html"><B>Contents</B></A>
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<B> Next:</B>
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<A HREF="node116.html"> About this document </A>
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<B>Up:</B>
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<A HREF="node72.html"> Appendix: Selected Lisp </A>
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<B> Previous:</B>
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<A HREF="node114.html"> symbolp (PREDICATE)</A>
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<BR> <HR> <P>
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<H1> y-or-n-p, yes-or-no-p (PREDICATES)</H1>
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<P>
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<b> Format:</b>
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<tt> (y-or-n-p)</tt>
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<tt> (y-or-n-p <string> )</tt>
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<tt> (yes-or-no-p)</tt>
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<tt> (yes-or-no-p <string> )</tt>
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<P>
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<b> Required arguments:</b>
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none
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<P>
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<b> Optional arguments:</b> 1
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<P>
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Optional argument must evaluate to a string
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<P>
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The user is prompted with the string text (if provided). y-or-n-p returns t if y or Y is entered or nil if n or N is entered, but reprompts the user if given any other response. yes-or-no-p behaves similarly but requires a yes or no respsonse (upper or lower case mixed is ok).
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<P>
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<b> Examples:</b>
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<P>
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<BLOCKQUOTE>
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<PRE>> (y-or-n-p "Well? ")
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Well? (Y or N) ok
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Well? (Y or N) no
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Well? (Y or N) y
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T
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> (yes-or-no-p "Answer in full:")
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Answer in full: (Yes or No) y
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Answer in full: (Yes or No) n
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Answer in full: (Yes or No) nO
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NIL
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</PRE>
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</BLOCKQUOTE>
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<BR> <HR>
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<P>
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<ADDRESS>
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<I>© Colin Allen & Maneesh Dhagat <BR>
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March 2007 </I>
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</ADDRESS>
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</BODY>
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