# Printf "%#o\\n", -1

**URL:** <https://www.ruby-forum.com/t/printf-o-n-1/127121>\
**Category:** Development\
**Created:** [January 25, 2008, 4:41am UTC](https://www.ruby-forum.com/t/printf-o-n-1/127121 "2008-01-25T04:41:20Z")\
**Posts on this page:** 1\
**Page:** 1

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**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:** [January 25, 2008, 4:41am UTC](https://www.ruby-forum.com/t/printf-o-n-1/127121/1 "2008-01-25T04:41:20Z")

</div>

e$B0J2\<$N$h$&$Ke(B printf e$B$Ge(B %#o e$B$Ke(B -1 e$B$rM?$($k$He(B 0…7  
e$B$K$J$j$^$9!#e(B

% ./ruby -ve ‘printf “%#o\n”, -1’  
ruby 1.9.0 (2008-01-24 revision 0) [i686-linux]  
0…7

8e$B?J?t$Ge(B -1 e$B$re(B 8e$B$NJd?t$H$7$FI=8=$9$k$He(B 7  
e$B$,$:!\<$C$H\>e0L$N7e$Ke(B  
e$BB3$$$F$$$k$N$G!"e(B0 e$B$,F,$K$D$/$N$OJQ$J$s$8$c$J$$$G$7$g$&$+!#e(B