From: thomax@uropax.contrib.de (Thomas Kaulmann)
Subject: problems with g++-2.3.1, libg++-2.2, vax-ultrix
Organization: Contributed Software GbR
Distribution: gnu
Date: Sun, 22 Nov 1992 12:38:04 GMT

hello,

i've a problem in the libg++-2.2 test suite (rationals test) -
the problem occurs only on vax-ultrix. i've no probs with the stuff
on sunos, dec-ultix or ISC3.0..
the rest of the test works well, here are the results of the
tRational.cc test:

EXCEPT:
==========================================================================
one = 1
third = 1/3
half = 1/2
third + half = 5/6
third - half = -1/6
third * half = 1/6
third / half = 2/3
onePointTwo = 5404319552844595/4503599627370496
double(onePointTwo) = 1.2
a = 1
a += half = 3/2
a -= half = 1
a *= half = 1/2
a /= half = 1
approxpi = 355/113
double(approxpi) = 3.14159
rpi = Rational(PI) = 884279719003555/281474976710656
double(rpi) = 3.14159
approxpi + rpi = 199847224979684595/31806672368304128
approxpi - rpi = 8484881165/31806672368304128
approxpi * rpi = 313919300246262025/31806672368304128
approxpi / rpi = 19984723346456576/19984721649480343
-approxpi = -355/113
abs(negapproxpi) = 355/113

enter a Rational in form a/b or a: number = 61727839/49382716
approximating e as pow(1+1/n),n) for n =10
double(approxe) = 2.59374
log(approxe) = 0.953102
approxe = 25937424601/10000000000
approximating e as pow(1+1/n),n) for n =100
double(approxe) = 2.70481
log(approxe) = 0.995033
approxe = 2704813829421526093267194710807530833677938382781002776890201049117101
51430673927943945601434674459097335651375483564268312519281766832427980496322329
650055217977882315938008175933291885667484249510001/1000000000000000000000000000
00000000000000000000000000000000000000000000000000000000000000000000000000000000
00000000000000000000000000000000000000000000000000000000000000000000000000000000
0000000000000
approximating e as pow(1+1/n),n) for n =1000
double(approxe) = 2.71692
log(approxe) = 0.9995
approxe = 2716923932235892457383088121947577188964315018836572803722354774868894
94552376815899788569729866142905342103401540625692485946118761765388945775359308
33863995720635385004326501761444880461710448441218054796076480866070187420777983
75087855857012278053105042704758822511824867218226931719410407150364389665913091
82257681907228183573536578620217616722868619815846072464105240750630582621115696
47230644412959694982219192514792117009419351147555319726773601575614851442377868
16579422141378066423317811515462669946309306263409027388915931082226854264858661
42087827998353442412867246120635684746382136463050435966517157363539734603727475
24103681748774339412345431535111004716514728691160685284789769166005853834971801
72395573924789047989563714318957536493108041591460911612078698461739084741934442
44870141657548326389152909515801323311564853415408600931219048916854602439883424
38471351024116619960201295579214446663436410391379068075913427424642009919337227
91531063202677650581946360422!
027765645970182463780273161113009

End of test


OUTPUT:
==========================================================================
one = 1
third = 1/3
half = 1/2
third + half = 5/6
third - half = -1/6
third * half = 1/6
third / half = 2/3
onePointTwo = 21617278211378381/18014398509481984
double(onePointTwo) = 1.2
a = 1
a += half = 3/2
a -= half = 1
a *= half = 1/2
a /= half = 1
approxpi = 355/113
double(approxpi) = 3.14159
rpi = Rational(PI) = 28296951008113761/9007199254740992
double(rpi) = 3.14159
approxpi + rpi = 6395111199349907153/1017813515785732096
approxpi - rpi = 271516197167/1017813515785732096
approxpi * rpi = 10045417607880385155/1017813515785732096
approxpi / rpi = 3197555735433052160/3197555463916854993
-approxpi = -355/113
abs(negapproxpi) = 355/113

enter a Rational in form a/b or a: number = 61727839/49382716
approximating e as pow(1+1/n),n) for n =10
double(approxe) = 2.59374
log(approxe) = 0.953102
approxe = 25937424601/10000000000
approximating e as pow(1+1/n),n) for n =100
double(approxe) = 2.70481
log(approxe) = 0.995033
approxe = 2704813829421526093267194710807530833677938382781002776890201049117101
51430673927943945601434674459097335651375483564268312519281766832427980496322329
650055217977882315938008175933291885667484249510001/1000000000000000000000000000
00000000000000000000000000000000000000000000000000000000000000000000000000000000
00000000000000000000000000000000000000000000000000000000000000000000000000000000
0000000000000
approximating e as pow(1+1/n),n) for n =1000
double(approxe) = 2.71692
log(approxe) = 0.9995
approxe = 2716923932235892457383088121947577188964315018836572803722354774868894
94552376815899788569729866142905342103401540625692485946118761765388945775359308
33863995720635385004326501761444880461710448441218054796076480866070187420777983
75087855857012278053105042704758822511824867218226931719410407150364389665913091
82257681907228183573536578620217616722868619815846072464105240750630582621115696
47230644412959694982219192514792117009419351147555319726773601575614851442377868
16579422141378066423317811515462669946309306263409027388915931082226854264858661
42087827998353442412867246120635684746382136463050435966517157363539734603727475
24103681748774339412345431535111004716514728691160685284789769166005853834971801
72395573924789047989563714318957536493108041591460911612078698461739084741934442
44870141657548326389152909515801323311564853415408600931219048916854602439883424
38471351024116619960201295579214446663436410391379068075913427424642009919337227
91531063202677650581946360422!
027765645970182463780273161113009

End of test

DIFFERENCE
==========================================================================
8c8
< onePointTwo = 5404319552844595/4503599627370496
---
> onePointTwo = 21617278211378381/18014398509481984
17c17
< rpi = Rational(PI) = 884279719003555/281474976710656
---
> rpi = Rational(PI) = 28296951008113761/9007199254740992
19,22c19,22
< approxpi + rpi = 199847224979684595/31806672368304128
< approxpi - rpi = 8484881165/31806672368304128
< approxpi * rpi = 313919300246262025/31806672368304128
< approxpi / rpi = 19984723346456576/19984721649480343
---
> approxpi + rpi = 6395111199349907153/1017813515785732096
> approxpi - rpi = 271516197167/1017813515785732096
> approxpi * rpi = 10045417607880385155/1017813515785732096
> approxpi / rpi = 3197555735433052160/3197555463916854993


what is the error and how can i solve it??


thomax
-- 
Contributed Software, Thomas Kaulmann, Graefestr. 42, 1000 Berlin 61
G N U  &  N E T W O R K S  &  U N I X  Tel. : +49 30 694 69 07
Mail: thomax@contrib.de                Modem: +49 30 694 (6182|6749|6809)

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