package bigfloat;
require "bigint.pl";
+#
+# This library is no longer being maintained, and is included for backward
+# compatibility with Perl 4 programs which may require it.
+#
+# In particular, this should not be used as an example of modern Perl
+# programming techniques.
+#
+# Suggested alternative: Math::BigFloat
+#
# Arbitrary length float math package
#
# by Mark Biggar
#
# number format
# canonical strings have the form /[+-]\d+E[+-]\d+/
-# Input values can have inbedded whitespace
+# Input values can have embedded whitespace
# Error returns
# 'NaN' An input parameter was "Not a Number" or
# divide by zero or sqrt of negative number
$scale = length($xm)-1 if (length($xm)-1 > $scale);
$scale = length($ym)-1 if (length($ym)-1 > $scale);
$scale = $scale + length($ym) - length($xm);
- &norm(&round(&'bdiv($xm.('0' x $scale),$ym),$ym),
+ &norm(&round(&'bdiv($xm.('0' x $scale),$ym),&'babs($ym)),
$xe-$ye-$scale);
}
}
if ($xe < 1) {
'+0E+0';
} elsif ($xe == 1) {
- &norm(&round('+0',"+0".substr($xm,$[+1,1),"+10"), $scale);
+ # The first substr preserves the sign, which means that
+ # we'll pass a non-normalized "-0" to &round when rounding
+ # -0.006 (for example), purely so that &round won't lose
+ # the sign.
+ &norm(&round(substr($xm,$[,1).'0',
+ "+0".substr($xm,$[+1,1),"+10"), $scale);
} else {
&norm(&round(substr($xm,$[,$xe),
"+0".substr($xm,$[+$xe,1),"+10"), $scale);