71 lines
4.3 KiB
HTML
71 lines
4.3 KiB
HTML
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<TITLE>CLHS: Function DIGIT-CHAR-P</TITLE>
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<A NAME="digit-char-p"><I>Function</I> <B>DIGIT-CHAR-P</B></A> <P>
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<P><B>Syntax:</B><P>
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<P>
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<B>digit-char-p</B> <I>char <TT>&optional</TT> radix</I> => <I>weight</I><P>
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<P>
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<P><B>Arguments and Values:</B><P>
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<P>
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<I>char</I>---a <A REL=DEFINITION HREF="26_glo_c.htm#character"><I>character</I></A>. <P>
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<I>radix</I>---a <A REL=DEFINITION HREF="26_glo_r.htm#radix"><I>radix</I></A>. The default is <TT>10</TT>. <P>
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<I>weight</I>---either a non-negative <A REL=DEFINITION HREF="26_glo_i.htm#integer"><I>integer</I></A> less than <I>radix</I>, or <A REL=DEFINITION HREF="26_glo_f.htm#false"><I>false</I></A>. <P>
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<P><B>Description:</B><P>
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<P>
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Tests whether <I>char</I> is a digit in the specified <I>radix</I> (i.e., with a weight less than <I>radix</I>). If it is a digit in that <I>radix</I>, its weight is returned as an <A REL=DEFINITION HREF="26_glo_i.htm#integer"><I>integer</I></A>; otherwise <A REL=DEFINITION HREF="a_nil.htm#nil"><B>nil</B></A> is returned. <P>
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<P><B>Examples:</B><P>
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<P>
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<PRE>
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(digit-char-p #\5) => 5
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(digit-char-p #\5 2) => <A REL=DEFINITION HREF="26_glo_f.htm#false">false</A>
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(digit-char-p #\A) => <A REL=DEFINITION HREF="26_glo_f.htm#false">false</A>
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(digit-char-p #\a) => <A REL=DEFINITION HREF="26_glo_f.htm#false">false</A>
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(digit-char-p #\A 11) => 10
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(digit-char-p #\a 11) => 10
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(mapcar #'(lambda (radix)
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(map 'list #'(lambda (x) (digit-char-p x radix))
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"059AaFGZ"))
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'(2 8 10 16 36))
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=> ((0 NIL NIL NIL NIL NIL NIL NIL)
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(0 5 NIL NIL NIL NIL NIL NIL)
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(0 5 9 NIL NIL NIL NIL NIL)
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(0 5 9 10 10 15 NIL NIL)
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(0 5 9 10 10 15 16 35))
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</PRE>
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</TT> <P>
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<P><B>Affected By:</B><P>
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<P>
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None. (In particular, the results of this predicate are independent of any special syntax which might have been enabled in the <A REL=DEFINITION HREF="26_glo_c.htm#current_readtable"><I>current readtable</I></A>.) <P>
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<P><B>Exceptional Situations:</B> None.
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<P>
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<P><B>See Also:</B><P>
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<P>
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<A REL=DEFINITION HREF="f_alphan.htm#alphanumericp"><B>alphanumericp</B></A> <P>
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<P><B>Notes:</B><P>
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<P>
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Digits are <A REL=DEFINITION HREF="26_glo_g.htm#graphic"><I>graphic</I></A> <A REL=DEFINITION HREF="26_glo_c.htm#character"><I>characters</I></A>. <P>
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