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
sub main'fnorm { #(string) return fnum_str
local($_) = @_;
s/\s+//g; # strip white space
- if (/^([+-]?)(\d*)(\.(\d*))?([Ee]([+-]?\d+))?$/ && "$2$4" ne '') {
- &norm(($1 ? "$1$2$4" : "+$2$4"),(($4 ne '') ? $6-length($4) : $6));
+ if (/^([+-]?)(\d*)(\.(\d*))?([Ee]([+-]?\d+))?$/
+ && ($2 ne '' || defined($4))) {
+ my $x = defined($4) ? $4 : '';
+ &norm(($1 ? "$1$2$x" : "+$2$x"), (($x ne '') ? $6-length($x) : $6));
} else {
'NaN';
}
sub main'fneg { #(fnum_str) return fnum_str
local($_) = &'fnorm($_[$[]);
vec($_,0,8) ^= ord('+') ^ ord('-') unless $_ eq '+0E+0'; # flip sign
- s/^H/N/;
+ if ( ord("\t") == 9 ) { # ascii
+ s/^H/N/;
+ }
+ else { # ebcdic character set
+ s/\373/N/;
+ }
$_;
}
$scale = length($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);