56 lines
4.5 KiB
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56 lines
4.5 KiB
HTML
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<TITLE>CLHS: Variable *READ-DEFAULT-FLOAT-FORMAT*</TITLE>
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<A NAME="STread-default-float-formatST"><I>Variable</I> <B>*READ-DEFAULT-FLOAT-FORMAT*</B></A> <P>
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<P><B>Value Type:</B><P>
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<P>
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one of the <A REL=DEFINITION HREF="26_glo_a.htm#atomic_type_specifier"><I>atomic type specifiers</I></A> <A REL=DEFINITION HREF="t_short_.htm#short-float"><B>short-float</B></A>, <A REL=DEFINITION HREF="t_short_.htm#single-float"><B>single-float</B></A>, <A REL=DEFINITION HREF="t_short_.htm#double-float"><B>double-float</B></A>, or <A REL=DEFINITION HREF="t_short_.htm#long-float"><B>long-float</B></A>, or else some other <A REL=DEFINITION HREF="26_glo_t.htm#type_specifier"><I>type specifier</I></A> defined by the <A REL=DEFINITION HREF="26_glo_i.htm#implementation"><I>implementation</I></A> to be acceptable. <P>
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<P><B>Initial Value:</B><P>
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<P>
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The <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbol</I></A> <A REL=DEFINITION HREF="t_short_.htm#single-float"><B>single-float</B></A>. <P>
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<P><B>Description:</B><P>
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<P>
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Controls the floating-point format that is to be used when reading a floating-point number that has no <A REL=DEFINITION HREF="26_glo_e.htm#exponent_marker"><I>exponent marker</I></A> or that has <TT>e</TT> or <TT>E</TT> for an <A REL=DEFINITION HREF="26_glo_e.htm#exponent_marker"><I>exponent marker</I></A>. Other <A REL=DEFINITION HREF="26_glo_e.htm#exponent_marker"><I>exponent markers</I></A> explicitly prescribe the floating-point format to be used. <P>
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The printer uses <A REL=DEFINITION HREF="#STread-default-float-formatST"><B>*read-default-float-format*</B></A> to guide the choice of <A REL=DEFINITION HREF="26_glo_e.htm#exponent_marker"><I>exponent markers</I></A> when printing floating-point numbers. <P>
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<P><B>Examples:</B><P>
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<P>
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<PRE>
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(let ((*read-default-float-format* 'double-float))
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(read-from-string "(1.0 1.0e0 1.0s0 1.0f0 1.0d0 1.0L0)"))
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=> (1.0 1.0 1.0 1.0 1.0 1.0) ;Implementation has float format F.
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=> (1.0 1.0 1.0s0 1.0 1.0 1.0) ;Implementation has float formats S and F.
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=> (1.0d0 1.0d0 1.0 1.0 1.0d0 1.0d0) ;Implementation has float formats F and D.
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=> (1.0d0 1.0d0 1.0s0 1.0 1.0d0 1.0d0) ;Implementation has float formats S, F, D.
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=> (1.0d0 1.0d0 1.0 1.0 1.0d0 1.0L0) ;Implementation has float formats F, D, L.
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=> (1.0d0 1.0d0 1.0s0 1.0 1.0d0 1.0L0) ;Implementation has formats S, F, D, L.
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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>See Also:</B> None.
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<P>
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<P><B>Notes:</B> None.
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