Strange behavior seen when ints have leading zeros

[Robert Campbell]

C:\dev\clojure>java -cp clojure.jar clojure.lang.Repl
Clojure 1.1.0-alpha-SNAPSHOT
user=> (def grid1 [01 02 03 04 05 06 07])
#'user/grid1
user=> grid1
[1 2 3 4 5 6 7]
user=> (def grid2 [01 02 03 04 05 06 07 08])
java.lang.NumberFormatException: Invalid number: 08
java.lang.Exception: Unmatched delimiter: ]
java.lang.Exception: Unmatched delimiter: )
user=>

Why does Clojure hate 8's? :-)

[Fogus]

> Why does Clojure hate 8's? :-)

It doesn't. By adding a leading zero you're telling Clojure that you
want octal numbers. There is no number 08 in octal, instead to write
the base-10 number 8 you would use 010 in octal.

-m

[Robert Campbell]

Oh, that's pretty neat. Thanks!

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[Ramakrishnan Muthukrishnan]

I guess that's because if you precede a number with 0, it is treated
as Octal numbers and there is no Octal 8. :-)

Just a guess. I may be wrong.

--
Ramakrishnan