# \[Bug:1.9\] ArgumentError on "%c" % 0x80

**URL:** <https://www.ruby-forum.com/t/bug-1-9-argumenterror-on-c-0x80/150505>\
**Category:** Development\
**Created:** [October 9, 2008, 9:13am UTC](https://www.ruby-forum.com/t/bug-1-9-argumenterror-on-c-0x80/150505 "2008-10-09T09:13:17Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![Tanaka\_A](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/c67d28/32.png) [@Tanaka\_A](https://www.ruby-forum.com/u/Tanaka_A)\
**Post date:** [October 9, 2008, 9:13am UTC](https://www.ruby-forum.com/t/bug-1-9-argumenterror-on-c-0x80/150505/1 "2008-10-09T09:13:17Z")

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“%c” % 0x80 e$B$,Nc30$K$J$j$^$9!#e(B

% ./ruby -ve ‘"%c" % 0x80’  
ruby 1.9.0 (2008-10-09 revision 19723) [i686-linux]  
-e:1: warning: useless use of % in void context  
-e:1:in `%': negative string size (or size too big) (ArgumentError) from -e:1:in`’

1.8 e$B$G$O$J$j$^$;$s!#e(B

% ruby-1.8 -ve ‘"%c" % 0x80’  
ruby 1.8.7 (2008-09-03 revision 17572) [i686-linux]  
-e:1: warning: useless use of % in void context

---

<div class="post-metadata">

**Author:** ![Tanaka\_A](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/c67d28/32.png) [@Tanaka\_A](https://www.ruby-forum.com/u/Tanaka_A)\
**Post date:** [October 9, 2008, 11:07am UTC](https://www.ruby-forum.com/t/bug-1-9-argumenterror-on-c-0x80/150505/2 "2008-10-09T11:07:47Z")

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In article [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid),  
Tanaka A. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) writes:

> “%c” % 0x80 e$B$,Nc30$K$J$j$^$9!#e(B

e$B$&$%$`!#%m%1!\<%k$K0MB8$7$F$$$k$h$&$G$9$M!#e(B

EUC-JP e$B$G$O$\*$-$^$9!#e(B

% LANG=ja\_JP.EUC-JP ./ruby -ve ‘“%c” % 0x80’  
ruby 1.9.0 (2008-10-09 revision 19725) [i686-linux]  
-e:1: warning: useless use of % in void context  
-e:1:in `%': negative string size (or size too big) (ArgumentError) from -e:1:in `’  
zsh: exit 1 LANG=ja\_JP.EUC-JP ./ruby -ve ‘“%c” % 0x80’

UTF-8 e$B$G$O$\*$-$^$;$s!#e(B

% LANG=ja\_JP.UTF-8 ./ruby -ve ‘“%c” % 0x80’  
ruby 1.9.0 (2008-10-09 revision 19725) [i686-linux]  
-e:1: warning: useless use of % in void context

7bit e$B$JJ8;zNs$N%(%s%3!\<%G%#%s%0$re(B US-ASCII e$B$K$7$J$/$J$C$?$3e(B  
e$B$H$N1F6A$H$b$$$($k$+$J$!!#e(B

---

<div class="post-metadata">

**Author:** ![Tanaka\_A](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/c67d28/32.png) [@Tanaka\_A](https://www.ruby-forum.com/u/Tanaka_A)\
**Post date:** [October 9, 2008, 1:00pm UTC](https://www.ruby-forum.com/t/bug-1-9-argumenterror-on-c-0x80/150505/3 "2008-10-09T13:00:12Z")

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e$B@.@%$G$9!#e(B

Tanaka A. wrote:

> ruby 1.9.0 (2008-10-09 revision 19725) [i686-linux]
> 
> 7bit e$B$JJ8;zNs$N%(%s%3!\<%G%#%s%0$re(B US-ASCII e$B$K$7$J$/$J$C$?$3e(B  
> e$B$H$N1F6A$H$b$$$($k$+$J$!!#e(B

printf("%c", codepoint) e$B$H$$$&2r\<a$K$J$j$^$9$N$G!"e(B  
EUC-JP e$B$GNc30$H$$$&$N$OBEEv$JF0:n$@$H;W$$$^$9!#e(B

e$BNc30$NFbMF$,8m$C$F$$$k5$$O$7$^$9$M!#e(B

---

<div class="post-metadata">

**Author:** ![Tanaka\_A](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/c67d28/32.png) [@Tanaka\_A](https://www.ruby-forum.com/u/Tanaka_A)\
**Post date:** [October 10, 2008, 9:21am UTC](https://www.ruby-forum.com/t/bug-1-9-argumenterror-on-c-0x80/150505/4 "2008-10-10T09:21:02Z")

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e$B%A%1%C%He(B #624 e$B$,99?7$5$l$^$7$?!#e(B (by Yui NARUSE)

e$B%+%F%4%je(B M17Ne$B$K%;%C%He(B  
e$B%9%F!\<%?%9e(B Opene$B$+$ie(BClosede$B$KJQ99e(B

r19737 e$B$Ge(B `%': invalid character (ArgumentError)  
e$B$rJV$9$h$&$K$J$j$^$7$?e(B

* * *

[http://redmine.ruby-lang.org/issues/show/624](http://redmine.ruby-lang.org/issues/show/624)