# \[Bug #793\] BigDecimal('Infinity').to\_r $B$,Nm$K$J$k(B

**URL:** <https://www.ruby-forum.com/t/bug-793-bigdecimal-infinity-to-r-b-nm-k-j-k-b/154115>\
**Category:** Development\
**Created:** [November 25, 2008, 3:35pm UTC](https://www.ruby-forum.com/t/bug-793-bigdecimal-infinity-to-r-b-nm-k-j-k-b/154115 "2008-11-25T15:35:08Z")\
**Posts on this page:** 6\
**Page:** 1

<div class="post-metadata">

**Author:** ![tadayoshi\_funaba](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/f0a364/32.png) [@tadayoshi\_funaba](https://www.ruby-forum.com/u/tadayoshi_funaba)\
**Post date:** [November 25, 2008, 3:35pm UTC](https://www.ruby-forum.com/t/bug-793-bigdecimal-infinity-to-r-b-nm-k-j-k-b/154115/1 "2008-11-25T15:35:08Z")

</div>

Bug #793: BigDecimal(‘Infinity’).to\_r e$B$,Nm$K$J$ke(B  
[http://redmine.ruby-lang.org/issues/show/793](http://redmine.ruby-lang.org/issues/show/793)

e$B5/I\<\<Te(B: tadayoshi funaba  
e$B%9%F!\<%?%9e(B: Open, e$BM%@hEYe(B: Normal

$ ./ruby -rbigdecimal -e “p BigDecimal(‘Infinity’).to\_r”  
(0/1)

1.8 e$B$G$bF1$8$G$9!#e(B

$ ruby18 -rbigdecimal -rbigdecimal/util -rrational -e “p  
BigDecimal(‘Infinity’).to\_r”  
Rational(0, 1)

e$B0JA0!"?V$M$?$H;W$&$N$G$9$,!“e(Bto\_i e$B$,e(B nil  
e$B$K$J$k$N$bLdBj$,$”$k$H;W$$$^$9!#e(B

$ ./ruby -rbigdecimal -e “p BigDecimal(‘Infinity’).to\_i”  
nil

---

<div class="post-metadata">

**Author:** ![tadayoshi\_funaba](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/f0a364/32.png) [@tadayoshi\_funaba](https://www.ruby-forum.com/u/tadayoshi_funaba)\
**Post date:** [November 25, 2008, 7:16pm UTC](https://www.ruby-forum.com/t/bug-793-bigdecimal-infinity-to-r-b-nm-k-j-k-b/154115/2 "2008-11-25T19:16:21Z")

</div>

e$B$^$D$b$He(B e$B$f$-$R$m$G$9e(B

In message “Re: [ruby-dev:37187] [Bug #793] BigDecimal(‘Infinity’).to\_r  
e$B$,Nm$K$J$ke(B”  
on Tue, 25 Nov 2008 23:29:59 +0900, tadayoshi funaba  
[removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) writes:

|$ ./ruby -rbigdecimal -e “p BigDecimal(‘Infinity’).to\_r”  
|(0/1)

|e$B0JA0!"?V$M$?$H;W$&$N$G$9$,!“e(Bto\_i e$B$,e(B nil e$B$K$J$k$N$bLdBj$,$”$k$H;W$$$^$9!#e(B  
|  
|$ ./ruby -rbigdecimal -e “p BigDecimal(‘Infinity’).to\_i”  
|nil

e$B$I$&$be(BBigDecimale$B$N;EMM$r8+$F$k$He(B

- BigDecimal.modee$B$H$$$&B0@-$,$“$j!”$I$N$h$&$J;~$KNc30$,H/e(B  
e$B@8$9$k$+%0%m!\<%P%k$J\>uBV$H$7$F@\_Dj$G$-$ke(B

- e$B%G%U%)%k%H$G$O$"$i$f$kNc30$rH/@8$5$;$J$$e(B

e$B$H$$$&0U;W$,$“$k$h$&$G$9!#8D?ME\*$K$O%0%m!\<%P%k$J\>uBV$b!”$^$:e(B  
e$B$$\>u67$G$bNc30$r5/$3$5$:7QB3$9$k$N$b!“$”$^$jNI$/$J$$@\_7W$G$Oe(B  
e$B$J$$$+$H46$8$J$$$G$b$J$$$G$9!#e(B

e$B$?$@!“e(BBigDecimale$B$GJD$8$F$k$&$A$O$&$l$7$$$3$H$b$”$k$N$+$b$7$le(B  
e$B$J$$$N$G!"!Ve(BRubye$B$N@$3&!W$KF~$C$F$/$ke(Bto\__e$B$G$OL@\<(E_$KNc30$rH/e(B  
e$B@8$5$;$k$3$H$K$7$^$9!#e(B

e$B$^$“!”?t3XCN$i$:$N;d$NH=CG$G$9$+$i!“4V0c$C$F$$$k2DG=@-$O$$$De(B  
e$B$b9b$$$N$G$9$,!”$=$N\>l9g$O$I$J$?$+;XE&$7$F$/$@$5$$!#e(B

```
                            e$B$^$D$b$He(B e$B$f$-$R$me(B /:|)

```

---

<div class="post-metadata">

**Author:** ![tadayoshi\_funaba](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/f0a364/32.png) [@tadayoshi\_funaba](https://www.ruby-forum.com/u/tadayoshi_funaba)\
**Post date:** [November 26, 2008, 2:07pm UTC](https://www.ruby-forum.com/t/bug-793-bigdecimal-infinity-to-r-b-nm-k-j-k-b/154115/3 "2008-11-26T14:07:24Z")

</div>

> e$B$I$&$be(BBigDecimale$B$N;EMM$r8+$F$k$He(B
> 
> - BigDecimal.modee$B$H$$$&B0@-$,$"$j!"$I$N$h$&$J;~$KNc30$,H/e(B  
> e$B@8$9$k$+%0%m!\<%P%k$J\>uBV$H$7$F@\_Dj$G$-$ke(B
> 
> - e$B%G%U%)%k%H$G$O$"$i$f$kNc30$rH/@8$5$;$J$$e(B

e$B$=$N%b!\<%I$Ge(B EXCEPTION\_ZERODIVIDE e$B$rM-8z$K$9$k$He(B Infinity  
e$B\<+BN$r:n$l$Je(B  
e$B$/$J$k$s$G$9$M!#Nm3d$Ge(B Infinity e$B$r@8$8$k$N$H!"e(BInfinity  
e$B$r:n$k$3$H$OJL$Ne(B  
e$B$h$&$K;W$&$N$G$9$,!"e(BMarshal.load  
e$B$b=PMh$J$/$J$j$^$9$M!#$3$&$$$&$b$N$J$Ne(B  
e$B$+$J!#e(B

$ ./irb-test -rbigdecimal  
main@190-20081126\> b = BigDecimal(‘Infinity’)  
#=\> #BigDecimal:827a9a4,‘Infinity’,4(4)  
main@190-20081126\>  
BigDecimal::mode(BigDecimal::EXCEPTION\_ZERODIVIDE,true)  
#=\> 1  
main@190-20081126\> BigDecimal(‘Infinity’)  
FloatDomainError: Computation results to ‘Infinity’  
from (irb):3:in `BigDecimal' from (irb):3 from ./bin/irb:12:in`’  
main@190-20081126\> Marshal.load(Marshal.dump(b))  
FloatDomainError: Computation results to ‘Infinity’  
from (irb):5:in `_load' from (irb):5:in`load’  
from (irb):5  
from ./bin/irb:12:in `’

---

<div class="post-metadata">

**Author:** ![tadayoshi\_funaba](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/f0a364/32.png) [@tadayoshi\_funaba](https://www.ruby-forum.com/u/tadayoshi_funaba)\
**Post date:** [November 26, 2008, 3:01pm UTC](https://www.ruby-forum.com/t/bug-793-bigdecimal-infinity-to-r-b-nm-k-j-k-b/154115/4 "2008-11-26T15:01:33Z")

</div>

> EXCEPTION\_ZERODIVIDE(e$B$He(BEXCEPTION\_OVERFLOW)e$B$,!"$I$&$$$&$o$1$@e(B  
> e$B$+e(BEXCEPTION\_INFINITYe$B$NJLL\>$K$J$C$F$^$9$M!#K\Mh$O;H$$J,$1$k$Ye(B  
> e$B$-$@$H;W$&$N$G$9$,!#e(B

e$B$"$"!"$J$k$[$I!#85$N;EMM$@$He(B BigDecimal(‘Infinity’).to\_i  
e$B$GNc30$r\>e$2$ke(B  
e$B$K$Oe(B EXCEPTION\_INFINITY  
e$B$r@\_Dj$7$J$1$l$P$J$i$J$$!"$G$b!"$=$&$9$k$He(B  
BigDecimal(‘Infinity’) e$B\<+BN$GNc30$H$J$C$F$7$^$&$o$1$G$9$M!#e(B

---

<div class="post-metadata">

**Author:** ![tadayoshi\_funaba](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/f0a364/32.png) [@tadayoshi\_funaba](https://www.ruby-forum.com/u/tadayoshi_funaba)\
**Post date:** [November 26, 2008, 2:17pm UTC](https://www.ruby-forum.com/t/bug-793-bigdecimal-infinity-to-r-b-nm-k-j-k-b/154115/5 "2008-11-26T14:17:25Z")

</div>

e$B$^$D$b$He(B e$B$f$-$R$m$G$9e(B

In message “Re: [ruby-dev:37204] Re: [Bug #793]  
BigDecimal(‘Infinity’).to\_r e$B$,Nm$K$J$ke(B”  
on Wed, 26 Nov 2008 22:01:52 +0900, Tadayoshi F.  
[removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) writes:

|e$B$=$N%b!\<%I$Ge(B EXCEPTION\_ZERODIVIDE e$B$rM-8z$K$9$k$He(B Infinity e$B\<+BN$r:n$l$Je(B  
|e$B$/$J$k$s$G$9$M!#Nm3d$Ge(B Infinity e$B$r@8$8$k$N$H!"e(BInfinity e$B$r:n$k$3$H$OJL$Ne(B  
|e$B$h$&$K;W$&$N$G$9$,!"e(BMarshal.load e$B$b=PMh$J$/$J$j$^$9$M!#$3$&$$$&$b$N$J$Ne(B  
|e$B$+$J!#e(B

EXCEPTION\_ZERODIVIDE(e$B$He(BEXCEPTION\_OVERFLOW)e$B$,!"$I$&$$$&$o$1$@e(B  
e$B$+e(BEXCEPTION\_INFINITYe$B$NJLL\>$K$J$C$F$^$9$M!#K\Mh$O;H$$J,$1$k$Ye(B  
e$B$-$@$H;W$&$N$G$9$,!#e(B

---

<div class="post-metadata">

**Author:** ![tadayoshi\_funaba](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/f0a364/32.png) [@tadayoshi\_funaba](https://www.ruby-forum.com/u/tadayoshi_funaba)\
**Post date:** [November 26, 2008, 4:17pm UTC](https://www.ruby-forum.com/t/bug-793-bigdecimal-infinity-to-r-b-nm-k-j-k-b/154115/6 "2008-11-26T16:17:34Z")

</div>

EXCEPTION\_ZERODIVIDE e$B$r@\_Dj$7$?\>l9g!"e(BBigDecimal#/  
e$B$GNc30$K$J$j$^$9e(B  
e$B$,!"e(Bdiv e$B$de(B divmod e$B$G$O$J$j$^$;$s!#e(BFloat  
e$B$G$b!"e(Bdiv e$B$ONc30$G$9$,!"e(B  
divmod e$B$G$ONc30$K$J$j$^$;$s!#e(BInteger e$B$G$O!"e(Bdive$B!"e(Bdivmod  
e$B$H$b$KNc30e(B  
e$B$K$J$j$^$9!#e(B

e$B0c$$$,$"$j$^$9$,!"$3$N$"$?$j$I$&$J$s$G$7$g$&!#$=$l$\>$l$K$D$$$Fe(B  
divmod  
e$B$He(B modulo e$B$N4X78$K$OL7=b$O$J$$$h$&$G$9!#e(B

$ ./irb-test -rbigdecimal  
main@190-20081126\>  
BigDecimal::mode(BigDecimal::EXCEPTION\_ZERODIVIDE,true)  
#=\> 16  
main@190-20081126\> BigDecimal(‘1’) / 0  
FloatDomainError: (VpDivd) Divide by zero  
from (irb):2:in `/' from (irb):2 from ./bin/irb:12:in`’  
main@190-20081126\> BigDecimal(‘1’).div(0)  
#=\> #BigDecimal:826d998,‘NaN’,4(4)  
main@190-20081126\> BigDecimal(‘1’).divmod(0)  
#=\> [#BigDecimal:82259e0,‘NaN’,4(4), #BigDecimal:8225a58,‘NaN’,4(4)]

main@190-20081126\> 1.0.div(0)  
ZeroDivisionError: divided by 0  
from (irb):5:in `div' from (irb):5 from ./bin/irb:12:in`’  
main@190-20081126\> 1.0.divmod(0)  
#=\> [NaN, NaN]