63 lines
1.6 KiB
HTML
63 lines
1.6 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3O//DTD W3 HTML 2.0//EN">
|
|
<!Originally converted to HTML using LaTeX2HTML 95 (Thu Jan 19 1995) by Nikos Drakos (nikos@cbl.leeds.ac.uk), CBLU, University of Leeds >
|
|
<HEAD>
|
|
<TITLE> numberp (PREDICATE)</TITLE>
|
|
</HEAD>
|
|
<BODY>
|
|
<meta name="description" value=" numberp (PREDICATE)">
|
|
<meta name="keywords" value="lp">
|
|
<meta name="resource-type" value="document">
|
|
<meta name="distribution" value="global">
|
|
<P>
|
|
<BR> <HR>
|
|
<A HREF="node109.html"><IMG ALIGN=BOTTOM ALT="next" SRC="next_motif.gif"></A>
|
|
<A HREF="node72.html"><IMG ALIGN=BOTTOM ALT="up" SRC="up_motif.gif"></A>
|
|
<A HREF="node107.html"><IMG ALIGN=BOTTOM ALT="previous" SRC="previous_motif.gif"></A> <BR>
|
|
<A HREF="lp.html"><B>Contents</B></A>
|
|
<B> Next:</B>
|
|
<A HREF="node109.html"> or (MACRO)</A>
|
|
<B>Up:</B>
|
|
<A HREF="node72.html"> Appendix: Selected Lisp </A>
|
|
<B> Previous:</B>
|
|
<A HREF="node107.html"> null (PREDICATE)</A>
|
|
<BR> <HR> <P>
|
|
<H1> numberp (PREDICATE)</H1>
|
|
<P>
|
|
<b> Format:</b>
|
|
<tt> (numberp <exp> )</tt>
|
|
<P>
|
|
<b> Required arguments:</b>
|
|
1
|
|
<P>
|
|
<tt> <exp> </tt>: any Lisp expression
|
|
<P>
|
|
The predicate numberp returns T if <tt> <exp> </tt> evaluates to a number (i.e. an object of type integer, ratio, float, or complex); numberp returns
|
|
NIL otherwise.
|
|
<P>
|
|
<b> Examples:</b>
|
|
<P>
|
|
<BLOCKQUOTE>
|
|
<PRE>> (numberp 1/2)
|
|
T
|
|
|
|
> (numberp 1235439)
|
|
T
|
|
|
|
> (numberp (/ 5 1.23))
|
|
T
|
|
|
|
> (numberp #C(1.2 -0.9))
|
|
T
|
|
|
|
> (numberp '(+ 1 2 3))
|
|
NIL
|
|
</PRE>
|
|
</BLOCKQUOTE>
|
|
<P>
|
|
<BR> <HR>
|
|
<P>
|
|
<ADDRESS>
|
|
<I>© Colin Allen & Maneesh Dhagat <BR>
|
|
March 2007 </I>
|
|
</ADDRESS>
|
|
</BODY>
|