77 lines
6.3 KiB
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77 lines
6.3 KiB
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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: Variable *PRINT-BASE*, *PRINT-RADIX*</TITLE>
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<A NAME="STprint-baseST"><A NAME="STprint-radixST"><I>Variable</I> <B>*PRINT-BASE*, *PRINT-RADIX*</B></A></A> <P>
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<P><B>Value Type:</B><P>
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<P>
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<A REL=DEFINITION HREF="#STprint-baseST"><B>*print-base*</B></A>---a <A REL=DEFINITION HREF="26_glo_r.htm#radix"><I>radix</I></A>. <A REL=DEFINITION HREF="#STprint-radixST"><B>*print-radix*</B></A>---a <A REL=DEFINITION HREF="26_glo_g.htm#generalized_boolean"><I>generalized boolean</I></A>. <P>
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<P><B>Initial Value:</B><P>
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<P>
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The initial <A REL=DEFINITION HREF="26_glo_v.htm#value"><I>value</I></A> of <A REL=DEFINITION HREF="#STprint-baseST"><B>*print-base*</B></A> is <TT>10</TT>. The initial <A REL=DEFINITION HREF="26_glo_v.htm#value"><I>value</I></A> of <A REL=DEFINITION HREF="#STprint-radixST"><B>*print-radix*</B></A> is <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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<A REL=DEFINITION HREF="#STprint-baseST"><B>*print-base*</B></A> and <A REL=DEFINITION HREF="#STprint-radixST"><B>*print-radix*</B></A> control the printing of <A REL=DEFINITION HREF="26_glo_r.htm#rational"><I>rationals</I></A>. The <A REL=DEFINITION HREF="26_glo_v.htm#value"><I>value</I></A> of <A REL=DEFINITION HREF="#STprint-baseST"><B>*print-base*</B></A> is called the <A REL=DEFINITION HREF="26_glo_c.htm#current_output_base"><I>current output base</I></A>. <P>
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The <A REL=DEFINITION HREF="26_glo_v.htm#value"><I>value</I></A> of <A REL=DEFINITION HREF="#STprint-baseST"><B>*print-base*</B></A> is the <A REL=DEFINITION HREF="26_glo_r.htm#radix"><I>radix</I></A> in which the printer will print <A REL=DEFINITION HREF="26_glo_r.htm#rational"><I>rationals</I></A>. For radices above <TT>10</TT>, letters of the alphabet are used to represent digits above <TT>9</TT>. <P>
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If the <A REL=DEFINITION HREF="26_glo_v.htm#value"><I>value</I></A> of <A REL=DEFINITION HREF="#STprint-radixST"><B>*print-radix*</B></A> is <A REL=DEFINITION HREF="26_glo_t.htm#true"><I>true</I></A>, the printer will print a radix specifier to indicate the <A REL=DEFINITION HREF="26_glo_r.htm#radix"><I>radix</I></A> in which it is printing a <A REL=DEFINITION HREF="26_glo_r.htm#rational"><I>rational</I></A> number. The radix specifier is always printed using lowercase letters. If <A REL=DEFINITION HREF="#STprint-baseST"><B>*print-base*</B></A> is <TT>2</TT>, <TT>8</TT>, or <TT>16</TT>, then the radix specifier used is <TT>#b</TT>, <TT>#o</TT>, or <TT>#x</TT>, respectively. For <A REL=DEFINITION HREF="26_glo_i.htm#integer"><I>integers</I></A>, base ten is indicated by a trailing decimal point instead of a leading radix specifier; for <A REL=DEFINITION HREF="26_glo_r.htm#ratio"><I>ratios</I></A>, <TT>#10r</TT> is used. <P>
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<P><B>Examples:</B><P>
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<P>
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<PRE>
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(let ((*print-base* 24.) (*print-radix* t))
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(print 23.))
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>> #24rN
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=> 23
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(setq *print-base* 10) => 10
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(setq *print-radix* nil) => NIL
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(dotimes (i 35)
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(let ((*print-base* (+ i 2))) ;print the decimal number 40
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(write 40) ;in each base from 2 to 36
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(if (zerop (mod i 10)) (terpri) (format t " "))))
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>> 101000
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>> 1111 220 130 104 55 50 44 40 37 34
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>> 31 2C 2A 28 26 24 22 20 1J 1I
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>> 1H 1G 1F 1E 1D 1C 1B 1A 19 18
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>> 17 16 15 14
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=> NIL
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(dolist (pb '(2 3 8 10 16))
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(let ((*print-radix* t) ;print the integer 10 and
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(*print-base* pb)) ;the ratio 1/10 in bases 2,
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(format t "~&~S ~S~%" 10 1/10))) ;3, 8, 10, 16
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>> #b1010 #b1/1010
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>> #3r101 #3r1/101
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>> #o12 #o1/12
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>> 10. #10r1/10
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>> #xA #x1/A
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=> NIL
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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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Might be <A REL=DEFINITION HREF="26_glo_b.htm#bound"><I>bound</I></A> by <A REL=DEFINITION HREF="f_format.htm#format"><B>format</B></A>, and <A REL=DEFINITION HREF="f_wr_pr.htm#write"><B>write</B></A>, <A REL=DEFINITION HREF="f_wr_to_.htm#write-to-string"><B>write-to-string</B></A>. <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_format.htm#format"><B>format</B></A>, <A REL=DEFINITION HREF="f_wr_pr.htm#write"><B>write</B></A>, <A REL=DEFINITION HREF="f_wr_to_.htm#write-to-string"><B>write-to-string</B></A> <P>
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<P><B>Notes:</B> None.
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<P>
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