224 lines
5.3 KiB
HTML
224 lines
5.3 KiB
HTML
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<!DOCTYPE HTML>
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<HTML LANG="en-us"
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>*read-default-float-format* | Common Lisp Nova Spec</TITLE
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>Common Lisp Nova Spec</A
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> <SPAN CLASS="breadcrumb-item"
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>→ <A HREF="v_read-default-float-format.html"
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>*read-default-float-format*</A
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>←</A
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>Apropos </SPAN
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><INPUT ID="apropos" AUTOFOCUS="AUTOFOCUS" PLACEHOLDER="Type here to search" ONINPUT="aproposInput(this);" ONKEYUP="aproposKeyup(event);" ONCHANGE="aproposChange(this);" ONFOCUS="aproposFocus(this);" ONFOCUSOUT="aproposFocusout(this);"
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>→</A
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><TD ALIGN="LEFT" VALIGN="BASELINE" WIDTH="100%" CLASS="name"
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><SPAN CLASS="idx" DATA-KIND="idxref" DATA-TERM="*read-default-float-format*"
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></SPAN
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><SPAN CLASS="cmsy"
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>*</SPAN
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><B
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>read-default-float-format</B
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><SPAN CLASS="cmsy"
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>*</SPAN
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></TD
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><TD ALIGN="RIGHT" VALIGN="BASELINE" WIDTH="0" NOWRAP="NOWRAP" CLASS="ftype"
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><I
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>Variable</I
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></TD
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></TR
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></TABLE
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><UL CLASS="subtoc"
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></UL
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><DL
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><DT
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><B
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>Value Type</B
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></DT
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><DD
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><P CLASS="j"
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>one of the <A HREF="26_1_Glossary.html#atomic_type_specifier"
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><EM CLASS="term"
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>atomic type specifiers</EM
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></A
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> <A HREF="t_short-float.html" CLASS="typeref"
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><B
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>short-float</B
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></A
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>, <A HREF="t_short-float.html" CLASS="typeref"
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><B
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>single-float</B
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></A
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>, <A HREF="t_short-float.html" CLASS="typeref"
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><B
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>double-float</B
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></A
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>, or <A HREF="t_short-float.html" CLASS="typeref"
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><B
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>long-float</B
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></A
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>, or else some other <A HREF="26_1_Glossary.html#type_specifier"
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><EM CLASS="term"
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>type specifier</EM
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></A
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> defined by the <A HREF="26_1_Glossary.html#implementation"
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><EM CLASS="term"
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>implementation</EM
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></A
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> to be acceptable.</P
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></DD
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><DT
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><B
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>Initial Value</B
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></DT
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><DD
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><P CLASS="j"
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>The <A HREF="26_1_Glossary.html#symbol"
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><EM CLASS="term"
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>symbol</EM
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></A
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> <A HREF="t_short-float.html" CLASS="typeref"
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><B
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>single-float</B
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></A
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>.</P
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></DD
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><DT
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><B
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>Description</B
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></DT
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><DD
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><P CLASS="j"
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>Controls the floating-point format that is to be used when reading a floating-point number that has no <A HREF="26_1_Glossary.html#exponent_marker"
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><EM CLASS="term"
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>exponent marker</EM
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></A
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> or that has <CODE CLASS="f"
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>e</CODE
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> or <CODE CLASS="f"
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>E</CODE
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> for an <A HREF="26_1_Glossary.html#exponent_marker"
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><EM CLASS="term"
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>exponent marker</EM
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></A
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>. Other <A HREF="26_1_Glossary.html#exponent_marker"
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><EM CLASS="term"
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>exponent markers</EM
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></A
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> explicitly prescribe the floating-point format to be used. </P
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><P CLASS="j"
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>The printer uses <A HREF="v_read-default-float-format.html" CLASS="varref"
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><B
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>*read-default-float-format*</B
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></A
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> to guide the choice of <A HREF="26_1_Glossary.html#exponent_marker"
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><EM CLASS="term"
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>exponent markers</EM
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></A
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> when printing floating-point numbers.</P
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></DD
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><DT
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><B
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>Examples</B
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></DT
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><DD
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><PRE CLASS="screen"
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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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<SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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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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<SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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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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<SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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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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<SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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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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<SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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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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<SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> (1.0d0 1.0d0 1.0s0 1.0 1.0d0 1.0L0) ;Implementation has formats S, F, D, L.</PRE
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></DD
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></DL
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></DIV
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></DIV
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><DIV CLASS="footer"
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><DIV CLASS="btmnav"
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><A HREF="v_read-base.html" CLASS="prev"
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>←</A
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><A HREF="v_read-eval.html" CLASS="next"
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>→</A
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></DIV
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><DIV CLASS="trail"
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>Conversion to HTML copyright 2023 by Gilbert Baumann</DIV
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></DIV
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></DIV
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><SCRIPT
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>
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