> [EMAIL PROTECTED] - Thu Jan 04 10:10:18 2001]: > > # The following complete four-line perl script produces unexpected > # results on my machine. The multiplication in the second line of > # code below produces a negative result where a positive number is > # expected, presumably because an integer multiplication was used > # internally where a floating point operation was needed. If the > # expression is broken up and evaluated piece by piece then the > # correct result is produced (line 4). (The difference between the two > # results is, naturally, 2**32.) The same results were produced under > # perl v5.6.0. > > my ($p, $x, $y) = (65537, 64645, 34463); > print (($x % $p) * ($y % $p), "\n"); # produces -2067106661 > (incorrect) > my ($a, $b) = ($x % $p, $y % $p); > print $a * $b, "\n"; # produces 2227860635 > (correct)
Confirmed broken in 5.6.2. Confirmed fixed in 5.8.0. 0 windhund ~/tmp$ perl5.6.2 test -2067106661 2227860635 0 windhund ~/tmp$ perl5.5.4 test -2067106661 2227860635 0 windhund ~/tmp$ perl5.8.6 test 2227860635 2227860635 0 windhund ~/tmp$ perl5.8.0 test 2227860635 2227860635 0 windhund ~/tmp$ perl5.8.1 test 2227860635 2227860635
