# \[Bug #1328\] "p eval('0' + '+0.1'\*n)" $B$N5sF0(B

**URL:** <https://www.ruby-forum.com/t/bug-1328-p-eval-0-0-1-n-b-n5sf0-b/164204>\
**Category:** Development\
**Created:** [March 29, 2009, 10:51pm UTC](https://www.ruby-forum.com/t/bug-1328-p-eval-0-0-1-n-b-n5sf0-b/164204 "2009-03-29T22:51:10Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![Kenta\_M](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/k/b5a626/32.png) [@Kenta\_M](https://www.ruby-forum.com/u/Kenta_M)\
**Post date:** [March 29, 2009, 10:51pm UTC](https://www.ruby-forum.com/t/bug-1328-p-eval-0-0-1-n-b-n5sf0-b/164204/1 "2009-03-29T22:51:10Z")

</div>

Bug #1328: “p eval(‘0’ + ‘+0.1’\*n)” e$B$N5sF0e(B  
[http://redmine.ruby-lang.org/issues/show/1328](http://redmine.ruby-lang.org/issues/show/1328)

e$B5/I\<\<Te(B: Kenta M.  
e$B%9%F!\<%?%9e(B: Open, e$BM%@hEYe(B: Normal  
e$B%+%F%4%je(B: core, Target version: 1.9.2  
ruby -v: ruby 1.9.2dev (2009-03-29) [i386-darwin9.6.0]

“p eval(‘0’+‘+0.1’\*n)” e$B$rI\>2A$9$k$H!“e(Bn e$B$,$”$kCMe(B N  
e$B$rD6$($?$H$-$Ke(B  
e$B%9%?%C%/$,0n$l$^$9$,!"%P!\<%8%g%se(B 1.9.2 e$B$Ne(B N e$B$,e(B  
e$B%P!\<%8%g%se(B 1.9.1 e$B$h$je(B  
e$B\>.$5$/$J$C$F$$$^$9!#e(B

$ ~/ruby-1.9.1-r22762/bin/ruby -ve “p eval(‘0’+‘+0.1’\*13093)”  
ruby 1.9.1p0 (2009-03-04 revision 22762) [i386-darwin9.6.0]  
1309.2999999999  
$ ~/ruby-1.9.1-r22762/bin/ruby -ve “p eval(‘0’+‘+0.1’\*13094)”  
ruby 1.9.1p0 (2009-03-04 revision 22762) [i386-darwin9.6.0]  
-e:1:in `eval': stack level too deep (SystemStackError) from -e:1:in `’

$ ~/ruby-1.9.2-r23093/bin/ruby -ve “p eval(‘0’+‘+0.1’\*7481)”  
ruby 1.9.2dev (2009-03-29) [i386-darwin9.6.0]  
748.10000000010155  
$ ~/ruby-1.9.2-r23093/bin/ruby -ve “p eval(‘0’+‘+0.1’\*7482)”  
ruby 1.9.2dev (2009-03-29) [i386-darwin9.6.0]  
-e:1:in `eval': stack level too deep (SystemStackError) from -e:1:in `’

---

<div class="post-metadata">

**Author:** ![Kenta\_M](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/k/b5a626/32.png) [@Kenta\_M](https://www.ruby-forum.com/u/Kenta_M)\
**Post date:** [March 30, 2009, 5:47am UTC](https://www.ruby-forum.com/t/bug-1328-p-eval-0-0-1-n-b-n5sf0-b/164204/2 "2009-03-30T05:47:27Z")

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e$B$J$+$@$G$9!#e(B

At Mon, 30 Mar 2009 05:50:40 +0900,  
Kenta M. wrote in [ruby-dev:38207]:

> “p eval(‘0’+’+0.1’\*n)” e$B$rI\>2A$9$k$H!“e(Bn e$B$,$”$kCMe(B N e$B$rD6$($?$H$-$Ke(B  
> e$B%9%?%C%/$,0n$l$^$9$,!"%P!\<%8%g%se(B 1.9.2 e$B$Ne(B N e$B$,e(B e$B%P!\<%8%g%se(B 1.9.1 e$B$h$je(B  
> e$B\>.$5$/$J$C$F$$$^$9!#e(B

e$B:F8=$G$-$^$;$s$G$7$?!#e(B

$ ./ruby -ve “p eval(‘0’+’+0.1’\*6714)”  
ruby 1.9.2dev (2009-03-30 trunk 23097) [i386-darwin9.0]  
671.40000000008411

$ ./ruby -ve “p eval(‘0’+’+0.1’\*6715)”  
ruby 1.9.1p0 (2009-03-04 revision 22762) [i386-darwin9.6.0]  
-e:1:in `eval': stack level too deep (SystemStackError) from -e:1:in`’

> 748.10000000010155  
> $ ~/ruby-1.9.2-r23093/bin/ruby -ve “p eval(‘0’+’+0.1’\*7482)”  
> ruby 1.9.2dev (2009-03-29) [i386-darwin9.6.0]  
> -e:1:in `eval': stack level too deep (SystemStackError) from -e:1:in`’

e$B$=$l$\>$l$N%3%s%Q%$%k%\*%W%7%g%s$OF1$8$G$7$g$&$+!#e(B

---

<div class="post-metadata">

**Author:** ![Kenta\_M](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/k/b5a626/32.png) [@Kenta\_M](https://www.ruby-forum.com/u/Kenta_M)\
**Post date:** [March 31, 2009, 3:45pm UTC](https://www.ruby-forum.com/t/bug-1328-p-eval-0-0-1-n-b-n5sf0-b/164204/3 "2009-03-31T15:45:11Z")

</div>

e$B$`$i$?$G$9!#e(B

On 2009/03/30, at 12:47, Nobuyoshi N. wrote:

> $ ./ruby -ve “p eval(‘0’+’+0.1’\*6714)”
> 
> > 1309.2999999999  
> > -e:1:in `eval': stack level too deep (SystemStackError) from -e:1:in`’
> 
> e$B$=$l$\>$l$N%3%s%Q%$%k%\*%W%7%g%s$OF1$8$G$7$g$&$+!#e(B

configure e$B;~$Ke(B CFLAGS e$BEy$OFC$K;XDj$7$F$$$^$;$s$N$G!"e(B  
e$B%3%s%Q%$%k%\*%W%7%g%s$O3F%P!\<%8%g%s$N%G%U%)%k%H$,;XDj$5$l$F$$$^$9!#e(B

$ ~/ruby-1.9.2-r23093/bin/ruby -rrbconfig -ve ‘p  
Config::CONFIG[“CFLAGS”]’  
ruby 1.9.2dev (2009-03-29) [i386-darwin9.6.0]  
" -O3 -g -Wall -Wno-unused-parameter -Wno-parentheses -Wno-missing-  
field-initializers -Wshorten-64-to-32 -Wpointer-arith -Wwrite-strings -  
fno-common -pipe"

$ ~/ruby-1.9.1-r22762/bin/ruby -rrbconfig -ve ‘p  
Config::CONFIG[“CFLAGS”]’  
ruby 1.9.1p0 (2009-03-04 revision 22762) [i386-darwin9.6.0]  
" -O2 -g -Wall -Wno-parentheses -fno-common -pipe -fno-common"

e$B1F6A$7$=$&$J0c$$$Oe(B -O2 e$B$+$ie(B -O3 e$B$KJQ$o$C$?$H$3$me(B  
e$B$/$i$$$G$7$g$&$+!#e(B