63 lines
4.1 KiB
HTML
63 lines
4.1 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 MINUSP, PLUSP</TITLE>
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<A NAME="minusp"><A NAME="plusp"><I>Function</I> <B>MINUSP, PLUSP</B></A></A> <P>
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<P><B>Syntax:</B><P>
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<P>
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<B>minusp</B> <I>real</I> => <I>generalized-boolean</I><P>
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<P>
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<B>plusp</B> <I>real</I> => <I>generalized-boolean</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>real</I>---a <A REL=DEFINITION HREF="t_real.htm#real"><I>real</I></A>. <P>
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<I>generalized-boolean</I>---a <A REL=DEFINITION HREF="26_glo_g.htm#generalized_boolean"><I>generalized boolean</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="#minusp"><B>minusp</B></A> returns <A REL=DEFINITION HREF="26_glo_t.htm#true"><I>true</I></A> if <I>real</I> is less than zero; otherwise, returns <A REL=DEFINITION HREF="26_glo_f.htm#false"><I>false</I></A>. <P>
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<A REL=DEFINITION HREF="#plusp"><B>plusp</B></A> returns <A REL=DEFINITION HREF="26_glo_t.htm#true"><I>true</I></A> if <I>real</I> is greater than zero; otherwise, returns <A REL=DEFINITION HREF="26_glo_f.htm#false"><I>false</I></A>. <P>
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Regardless of whether an <A REL=DEFINITION HREF="26_glo_i.htm#implementation"><I>implementation</I></A> provides distinct representations for positive and negative <A REL=DEFINITION HREF="26_glo_f.htm#float"><I>float</I></A> zeros, <TT>(minusp -0.0)</TT> always returns <A REL=DEFINITION HREF="26_glo_f.htm#false"><I>false</I></A>. <P>
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<P><B>Examples:</B><P>
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<PRE>
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(minusp -1) => <A REL=DEFINITION HREF="26_glo_t.htm#true">true</A>
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(plusp 0) => <A REL=DEFINITION HREF="26_glo_f.htm#false">false</A>
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(plusp least-positive-single-float) => <A REL=DEFINITION HREF="26_glo_t.htm#true">true</A>
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</PRE>
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</TT> <P>
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<P><B>Side Effects:</B> None.
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<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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Should signal an error of <A REL=DEFINITION HREF="26_glo_t.htm#type"><I>type</I></A> <A REL=DEFINITION HREF="e_tp_err.htm#type-error"><B>type-error</B></A> if <I>real</I> is not a <A REL=DEFINITION HREF="t_real.htm#real"><I>real</I></A>. <P>
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<P><B>See Also:</B> None.
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<P>
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<P><B>Notes:</B> None.
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