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Postings from October 2003
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Moin,
Bingo:
I noticed that _pow() is not tested in bigintc.t at all, and added some tests
for it, and also some more tests with _root(). Which promptly fail, even on
my 32 bit system/perl:
# _pow (and _root)
$x = $C->_new(\"81"); $n = $C->_new(\"3"); # 81 ** 3 == 531441
ok (${$C->_str($C->_pow($x,$n))},81 ** 3);
ok (${$C->_str($C->_root($x,$n))},81); # (81 ** 3) ** 1/3 == 81
ok (${$C->_str($C->_pow($x,$n))},81 ** 3);
ok (${$C->_str($C->_pow($x,$n))},'150094635296999121'); # 531441 ** 3 ==
This produces:
not ok 153
# Test 153 got: '80' (t/bigintc.t at line 219)
# Expected: '81'
not ok 154
# Test 154 got: '512000' (t/bigintc.t at line 220)
# Expected: '531441'
not ok 155
# Test 155 got: '134217728000000000' (t/bigintc.t at line 221)
# Expected: '150094635296999121'
Damn, and I was so proud that v1.67 would be (probably) the first BigInt
release with no bugfixes over the last version *sigh*
Oh, something fishy is going on:
print $x->[0] ** (1 / $n->[0]), "\n";
$x->[0] = int( $x->[0] ** (1 / $n->[0]) );
print $x->[0],"\n";
This produces for $x == [ 81 **3 ] and $n == [3] the following output:
81
80
Huh?!? This is with Perl v5.8.0...
Best wishes,
Tels
- --
Signed on Tue Oct 7 20:06:36 2003 with key 0x93B84C15.
Visit my photo gallery at http://bloodgate.com/photos/
PGP key on http://bloodgate.com/tels.asc or per email.
"Remember: If the game let's you do it, it's not cheating." -- Xarax
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