66 lines
4.2 KiB
HTML
66 lines
4.2 KiB
HTML
<!-- 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: Function -</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="f_pl.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Previous]" SRC="../Graphics/Prev.gif" ALIGN=Bottom></A><A REL=UP HREF="c_number.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Up]" SRC="../Graphics/Up.gif" ALIGN=Bottom></A><A REL=NEXT HREF="f_sl.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Next]" SRC="../Graphics/Next.gif" ALIGN=Bottom></A></H1>
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<A NAME="-"><I>Function</I> <B>-</B></A> <P>
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<P><B>Syntax:</B><P>
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<P>
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<B>-</B> <I>number</I> => <I>negation</I><P>
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<P>
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<B>-</B> <I>minuend <TT>&rest</TT> subtrahends+</I> => <I>difference</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>number</I>, <I>minuend</I>, <I>subtrahend</I>---a <A REL=DEFINITION HREF="26_glo_n.htm#number"><I>number</I></A>. <P>
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<I>negation</I>, <I>difference</I>---a <A REL=DEFINITION HREF="26_glo_n.htm#number"><I>number</I></A>. <P>
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<P><B>Description:</B><P>
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<P>
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The <A REL=DEFINITION HREF="26_glo_f.htm#function"><I>function</I></A> <A REL=DEFINITION HREF="#-"><B>-</B></A> performs arithmetic subtraction and negation. <P>
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If only one <I>number</I> is supplied, the negation of that <I>number</I> is returned. <P>
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If more than one <A REL=DEFINITION HREF="26_glo_a.htm#argument"><I>argument</I></A> is given, it subtracts all of the <I>subtrahends</I> from the <I>minuend</I> and returns the result. <P>
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The <A REL=DEFINITION HREF="26_glo_f.htm#function"><I>function</I></A> <A REL=DEFINITION HREF="#-"><B>-</B></A> performs necessary type conversions. <P>
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<P><B>Examples:</B><P>
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<P>
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<PRE>
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(- 55.55) => -55.55
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(- #c(3 -5)) => #C(-3 5)
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(- 0) => 0
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(eql (- 0.0) -0.0) => <A REL=DEFINITION HREF="26_glo_t.htm#true">true</A>
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(- #c(100 45) #c(0 45)) => 100
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(- 10 1 2 3 4) => 0
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</PRE>
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</TT> <P>
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<P><B>Affected By:</B> None.
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<P>
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<P><B>Exceptional Situations:</B><P>
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<P>
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Might signal <A REL=DEFINITION HREF="e_tp_err.htm#type-error"><B>type-error</B></A> if some <A REL=DEFINITION HREF="26_glo_a.htm#argument"><I>argument</I></A> is not a <A REL=DEFINITION HREF="26_glo_n.htm#number"><I>number</I></A>. Might signal <A REL=DEFINITION HREF="e_arithm.htm#arithmetic-error"><B>arithmetic-error</B></A>. <P>
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<P><B>See Also:</B><P>
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<P>
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<A REL=CHILD HREF="12_aa.htm">Section 12.1.1 (Numeric Operations)</A>, <A REL=CHILD HREF="12_ac.htm">Section 12.1.3 (Rational Computations)</A>, <A REL=CHILD HREF="12_ad.htm">Section 12.1.4 (Floating-point Computations)</A>, <A REL=CHILD HREF="12_ae.htm">Section 12.1.5 (Complex Computations)</A> <P>
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<P><B>Notes:</B> None.
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<P>
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