65 lines
3.8 KiB
HTML
65 lines
3.8 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 1+, 1-</TITLE>
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<A NAME="1PL"><A NAME="1-"><I>Function</I> <B>1+, 1-</B></A></A> <P>
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<P><B>Syntax:</B><P>
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<P>
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<B>1+</B> <I>number</I> => <I>successor</I><P>
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<B>1-</B> <I>number</I> => <I>predecessor</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>---a <A REL=DEFINITION HREF="26_glo_n.htm#number"><I>number</I></A>. <P>
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<I>successor</I>, <I>predecessor</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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<A REL=DEFINITION HREF="#1PL"><B>1+</B></A> returns a <A REL=DEFINITION HREF="26_glo_n.htm#number"><I>number</I></A> that is one more than its argument <I>number</I>. <A REL=DEFINITION HREF="#1-"><B>1-</B></A> returns a <A REL=DEFINITION HREF="26_glo_n.htm#number"><I>number</I></A> that is one less than its argument <I>number</I>. <P>
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<P><B>Examples:</B><P>
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<P>
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<PRE>
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(1+ 99) => 100
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(1- 100) => 99
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(1+ (complex 0.0)) => #C(1.0 0.0)
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(1- 5/3) => 2/3
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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 its <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=DEFINITION HREF="m_incf_.htm#incf"><B>incf</B></A>, <A REL=DEFINITION HREF="m_incf_.htm#decf"><B>decf</B></A> <P>
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<P><B>Notes:</B><P>
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<P>
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<PRE>
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(1+ number) == (+ number 1)
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(1- number) == (- number 1)
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</PRE>
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</TT> Implementors are encouraged to make the performance of both the previous expressions be the same. <P>
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