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authorKarl Berry <karl@freefriends.org>2009-05-22 23:51:44 +0000
committerKarl Berry <karl@freefriends.org>2009-05-22 23:51:44 +0000
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+<head>
+<title>UK TeX FAQ -- question label dec_comma</title>
+</head><body>
+<h3>The comma as a decimal separator</h3>
+<p/>TeX embodies the British/American cultural convention of using a
+period as the separator between the whole number and the decimal
+fraction part of a decimal number. Other cultures use a comma as
+separator, but if you use a comma in maths mode you get a small space
+after it; this space makes a comma that is used as a decimal separator
+look untidy.
+<p/>A simple solution to this problem, in maths mode, is to type
+<code>3</code><code>{,}</code><code>14</code> in place of <code>3,14</code>. While such a
+technique may produce the right results, it is plainly not a
+comfortable way to undertake any but the most trivial amounts of
+typing numbers.
+<p/>Therefore, if you need to use commas as decimal separator, you will
+probably welcome macro support. There are two packages that
+can help relieve the tedium: <i>icomma</i> and <i>ziffer</i>.
+<p/><i>Icomma</i> ensures that there will be no extra space after a
+comma, unless you type a space after it (as in <code>f(x, y)</code> &mdash; in
+the absence of the package, you don&rsquo;t need that space), in which case
+the usual small space after the comma appears. <i>Ziffer</i> is
+specifically targeted at the needs of those typesetting German, but
+covers the present need, as well as providing the double-minus sign
+used in German (and other languages) for the empty &lsquo;cents&rsquo; part of an
+amount of currency.
+<p/>The <i>numprint</i> package provides a command
+<code>\</code><code>numprint{</code><em>number</em><code>}</code> that prints its argument according to
+settings you give it, or according to settings chosen to match the
+language you have selected in <i>babel</i>. The formatting works
+equally well in text or maths. The command is very flexible (it can also
+group the digits of very &lsquo;long&rsquo; numbers), but is inevitably less
+convenient than <i>icomma</i> or <i>ziffer</i> if you are typing a
+lot of numbers.
+<dl>
+<dt><tt><i>icomma.sty</i></tt><dd>Distributed as part of <a href="ftp://cam.ctan.org/tex-archive/macros/latex/contrib/was.zip">macros/latex/contrib/was</a> (<a href="ftp://cam.ctan.org/tex-archive/macros/latex/contrib/was.tar.gz">gzipped tar</a>, <a href="http://www.tex.ac.uk/tex-archive/macros/latex/contrib/was/">browse</a>)
+<dt><tt><i>numprint.sty</i></tt><dd><a href="ftp://cam.ctan.org/tex-archive/macros/latex/contrib/numprint.zip">macros/latex/contrib/numprint</a> (<a href="ftp://cam.ctan.org/tex-archive/macros/latex/contrib/numprint.tar.gz">gzipped tar</a>, <a href="http://www.tex.ac.uk/tex-archive/macros/latex/contrib/numprint/">browse</a>)
+<dt><tt><i>ziffer.sty</i></tt><dd><a href="ftp://cam.ctan.org/tex-archive/macros/latex/contrib/ziffer.zip">macros/latex/contrib/ziffer</a> (<a href="ftp://cam.ctan.org/tex-archive/macros/latex/contrib/ziffer.tar.gz">gzipped tar</a>, <a href="http://www.tex.ac.uk/tex-archive/macros/latex/contrib/ziffer/">browse</a>)
+</dl>
+<p/><p>This question on the Web: <a href="http://www.tex.ac.uk/cgi-bin/texfaq2html?label=dec_comma">http://www.tex.ac.uk/cgi-bin/texfaq2html?label=dec_comma</a>
+</body>