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68 lines
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<TITLE>CLHS: Section 2.3.1</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="02_c.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Previous]" SRC="../Graphics/Prev.gif" ALIGN=Bottom></A><A REL=UP HREF="02_c.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Up]" SRC="../Graphics/Up.gif" ALIGN=Bottom></A><A REL=NEXT HREF="02_caa.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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2.3.1 Numbers as Tokens</H2> <P>
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When a <A REL=DEFINITION HREF="26_glo_t.htm#token"><I>token</I></A> is read, it is interpreted as a <A REL=DEFINITION HREF="26_glo_n.htm#number"><I>number</I></A> or <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbol</I></A>. The <A REL=DEFINITION HREF="26_glo_t.htm#token"><I>token</I></A> is interpreted as a <A REL=DEFINITION HREF="26_glo_n.htm#number"><I>number</I></A> if it satisfies the syntax for numbers specified in the next figure. <P>
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<A NAME="syntaxfornumerictokens"> <PRE>
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numeric-token ::= integer |
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ratio |
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float
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integer ::= [sign]
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decimal-digit+
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decimal-point |
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[sign]
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digit+
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ratio ::= [sign]
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{digit}+
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slash
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{digit}+
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float ::= [sign]
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{decimal-digit}*
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decimal-point
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{decimal-digit}+
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[exponent]
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[sign]
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{decimal-digit}+
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[decimal-point
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{decimal-digit}*]
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exponent
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exponent ::= exponent-marker
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[sign]
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{digit}+
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sign---a <A REL=DEFINITION HREF="26_glo_s.htm#sign">sign</A>.
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slash---a <A REL=DEFINITION HREF="26_glo_s.htm#slash">slash</A>
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decimal-point---a <A REL=DEFINITION HREF="26_glo_d.htm#dot">dot</A>.
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exponent-marker---an <A REL=DEFINITION HREF="26_glo_e.htm#exponent_marker">exponent marker</A>.
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decimal-digit---a <A REL=DEFINITION HREF="26_glo_d.htm#digit">digit</A> in <A REL=DEFINITION HREF="26_glo_r.htm#radix">radix</A> 10.
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digit---a <A REL=DEFINITION HREF="26_glo_d.htm#digit">digit</A> in the current input radix.
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</PRE>
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<P><B>Figure 2-9. Syntax for Numeric Tokens</B></A> <P>
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<A REL=CHILD HREF="02_caa.htm"><H2>
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2.3.1.1 Potential Numbers as Tokens</H2></A><P><HR>
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<A REL=COPYRIGHT HREF="../Front/Help.htm#Legal"><I>Copyright 1996-2005, LispWorks Ltd. All rights reserved.</I></A><P>
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