>> Jason Purdy <[EMAIL PROTECTED]> writes:
> Is that #*1.11%10 a number theory to get to the same number? How did
> someone recognize that pattern? (my advanced calculus/comb math being
> a lil' rusty)
I don't know others, but I started by looking at the input and output,
like this:
0 0
1 1
... ...
9 9
10 1
11 2
12 3
... ...
18 9
19 1
20 2
As you can see it's just a series of 1 .. 9, except for 0. With that
in mind my first I tried something like (0,(1..9)x11)[$n]. Actually,
before that I tried something more like (0,(1..9)x2)[$a+$b] (where $a
and $b are the digits). Then I noticed that I could get the same
result using %9 and some conditionals. After putting this stuff aside
and having some sleep I just pictured the thing as a table like this:
0 1 2 3 4 ...
0 00 11 22 33 44 ...
1 10 21 32 43 54 ...
...
8 80 91 12 23 34 ...
9 90 11 22 33 44 ...
which made it kind of evident that 111%100 should do what I wanted.
*Then* I had a different problem to solve :-)
> What is \G ... $&? Gotta dig out my Camel book again.
Check out perlre and perlvar and the "g" option to m//.
A question of my own: why doesn't
s/\B.\B/$&$&/g
work as I expect, namely abcd -> abbccd. I really can't figure it out
by reading the docs.
TIA,
Marcelo
