Re: [FWP] fun with numbers

[Ilmari Karonen <iltzu@sci.fi>]

On Tue, 6 Jun 2000, Perl lover wrote:
> write a program as short as possible(i made one, less than 70
> characters) to print numbers derived from (x+y) ** n (n is 1 to 14)
> in the following format:

 [Pascal's triangle snipped]

Shorter entries have already been posted, but just for fun I'd like to add
one that doesn't use an array:

  perl -e 'for($_="\n";s/\d+(?= (\d+))/$&+$1/eg<14;print){s/^/1 /}'

This was derived from my one-line ASCII Sierpinski triangle generator by
applying the fact that a "discrete Sirpinski triangle" is nothing more
than a Pascal's triangle modulo 2: 

  perl -e 'for($_="db\n";print;s/..(?=d)/$&^"DB"/eg){s/^/ /}' | less

(How's that for obfuscated Perl? I really like that bitwise xor..)

-- 
Ilmari Karonen
http://www.sci.fi/~iltzu/


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