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47 lines
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<TITLE>CLHS: Section 12.1.4.1.1</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="12_ada.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Previous]" SRC="../Graphics/Prev.gif" ALIGN=Bottom></A><A REL=UP HREF="12_ada.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Up]" SRC="../Graphics/Up.gif" ALIGN=Bottom></A><A REL=NEXT HREF="12_adb.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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12.1.4.1.1 Examples of Rule of Float and Rational Contagion</H2> <P>
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<PRE>
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;;;; Combining rationals with floats.
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;;; This example assumes an implementation in which
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;;; (float-radix 0.5) is 2 (as in IEEE) or 16 (as in IBM/360),
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;;; or else some other implementation in which 1/2 has an exact
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;;; representation in floating point.
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(+ 1/2 0.5) => 1.0
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(- 1/2 0.5d0) => 0.0d0
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(+ 0.5 -0.5 1/2) => 0.5
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;;;; Comparing rationals with floats.
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;;; This example assumes an implementation in which the default float
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;;; format is IEEE single-float, IEEE double-float, or some other format
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;;; in which 5/7 is rounded upwards by FLOAT.
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(< 5/7 (float 5/7)) => <A REL=DEFINITION HREF="26_glo_t.htm#true">true</A>
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(< 5/7 (rational (float 5/7))) => <A REL=DEFINITION HREF="26_glo_t.htm#true">true</A>
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(< (float 5/7) (float 5/7)) => <A REL=DEFINITION HREF="26_glo_f.htm#false">false</A>
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</PRE>
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</TT> <P>
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