# \[Bug:1.9.1\] rubyspec: BigDecimal#div returns NaN if divided by zero and no precision given ERROR

**URL:** <https://www.ruby-forum.com/t/bug-1-9-1-rubyspec-bigdecimal-div-returns-nan-if-divided-by-zero-and-no-precision-given-error/182633>\
**Category:** Development\
**Created:** [January 31, 2010, 6:11pm UTC](https://www.ruby-forum.com/t/bug-1-9-1-rubyspec-bigdecimal-div-returns-nan-if-divided-by-zero-and-no-precision-given-error/182633 "2010-01-31T18:11:37Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Yusuke\_ENDOH](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/y/c89c15/32.png) [@Yusuke\_ENDOH](https://www.ruby-forum.com/u/Yusuke_ENDOH)\
**Post date:** [January 31, 2010, 6:11pm UTC](https://www.ruby-forum.com/t/bug-1-9-1-rubyspec-bigdecimal-div-returns-nan-if-divided-by-zero-and-no-precision-given-error/182633/1 "2010-01-31T18:11:37Z")

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Yugui e$B$5$se(B  
e$B1sF#$G$9!#e(B

trunk e$B$G$O!"e(BBigDecimal e$B$N=|;;$,e(B NaN e$B$G$J$/e(B  
ZeroDivisionError e$B$re(B  
e$BEj$2$k$h$&$K$J$C$F$$$^$9e(B (r20368 e$B!"e(Br20383) e$B!#e(B

e$B$3$l$O!"e(B1.9.1 e$B$K%P%C%/%]!\<%H$5$l$k$G$7$g$&$+!#e(B  
1.9.2 e$B$+$i$N;EMMJQ99$H$J$k$G$7$g$&$+!#e(B

---

<div class="post-metadata">

**Author:** ![Yusuke\_ENDOH](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/y/c89c15/32.png) [@Yusuke\_ENDOH](https://www.ruby-forum.com/u/Yusuke_ENDOH)\
**Post date:** [February 20, 2010, 12:23pm UTC](https://www.ruby-forum.com/t/bug-1-9-1-rubyspec-bigdecimal-div-returns-nan-if-divided-by-zero-and-no-precision-given-error/182633/2 "2010-02-20T12:23:41Z")

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Yuguie$B$G$9!#e(B

On 2/1/10 2:10 AM, Yusuke ENDOH wrote:

> trunk e$B$G$O!"e(BBigDecimal e$B$N=|;;$,e(B NaN e$B$G$J$/e(B ZeroDivisionError e$B$re(B  
> e$BEj$2$k$h$&$K$J$C$F$$$^$9e(B (r20368 e$B!"e(Br20383) e$B!#e(B
> 
> e$B$3$l$O!"e(B1.9.1 e$B$K%P%C%/%]!\<%H$5$l$k$G$7$g$&$+!#e(B  
> 1.9.2 e$B$+$i$N;EMMJQ99$H$J$k$G$7$g$&$+!#e(B

e$B7kO@$+$i8@$($P!"%P%C%/%]!\<%H$O$7$^$;$s!#e(B1.8e$B$G$b$:$C$H$=$&$$$&5sF0$G$7$?e(B  
e$B$7!"$3$l$O;EMMJQ99$HG’\<1$7$^$9!#e(B

e$B?t3X7O$N%i%$%V%i%j$GL58BBge(B/e$BL58B\>.e(B/e$BFC0[E@$^$o$j$O$+$J$j5sF0$,$$$$2C8:$J$Ne(B  
e$B$Ge(B(e$B$=$b$=$b$Ne(Blibme$B$9$i$be(B)e$B!"e(Bmrkne$B$5$s$b%3%\_%C%?$K$J$C$?:#!“e(B2.0e$B$K8~$1$F%f!\<e(B  
e$B%6!\<$,M=B,2DG=$+$D9gM}E\*$J;EMM$r:n$C$F$$$/$3$H$K0[O@$O$”$j$^$;$s!#$?$@!"e(B  
e$B$3$l$re(B1.9.1e$B$K$O4pK\E\*$K%P%C%/%]!\<%H$7$^$;$s!#e(B

e$B$^$?!"$3$l$i$N5sF0$,3d$He(Bunstablee$B$G$"$k$3$H$Oe(B1.9.2e$B%j%j!\<%9;~$KL@5-$9$Y$-e(B  
e$B$@$H;W$C$F$$$^$9!#e(B