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Perl operator 'x'

rajshah13
New User

Nov 19, 2012, 5:55 PM

Post #1 of 8 (3212 views)

Perl operator 'x'	Can't Post

how can i produce and print the line: '666:666:666:god help us!'
without printing any number 6 and with only one : with perl script ?

FishMonger
Veteran / Moderator

Nov 20, 2012, 6:41 AM

Post #2 of 8 (3210 views)

Re: [rajshah13] Perl operator 'x' [In reply to]	Can't Post

See: perldoc -f join
http://perldoc.perl.org/functions/join.html

Laurent_R
Veteran / Moderator

Nov 20, 2012, 10:16 AM

Post #3 of 8 (3206 views)

Re: [rajshah13] Perl operator 'x' [In reply to]	Can't Post

An example not even using 6:

Code

my $nb = 777 - 111; 
my $line = $nb . ":"; 
$line = $line x 3; 
$line = $line . "God";

;-)

(This post was edited by Laurent_R on Nov 20, 2012, 10:32 AM)

FishMonger
Veteran / Moderator

Nov 20, 2012, 10:47 AM

Post #4 of 8 (3201 views)

Re: [Laurent_R] Perl operator 'x' [In reply to]	Can't Post

I was holding off providing a solution because this is clearly a homework assignment where the OP hasn't shown any attempt.

Since "the cat's out of the bag", I'll show one anyway.

Code

print join ':', (555+111) x 3, 'god help us!';

(This post was edited by FishMonger on Nov 20, 2012, 10:48 AM)

Laurent_R
Veteran / Moderator

Nov 20, 2012, 2:06 PM

Post #5 of 8 (3192 views)

Re: [FishMonger] Perl operator 'x' [In reply to]	Can't Post

Yeah, I did not think about possible homework, but now that you say it, it is fairly clear.

At the same time, the solution I suggested does work, but was not meant to be very serious, but more as a clue on how it could be done. I realize now that it can be used as an answer to an assignment, even though there could be better ones. For one, the x operator could be better used, but I won't say more.

rovf
Veteran

Nov 21, 2012, 1:31 AM

Post #6 of 8 (3178 views)

Re: [FishMonger] Perl operator 'x' [In reply to]	Can't Post

This doesn't fulfil the OPs specification. Note that the problem spec says:

Quote

... without printing any number 6

Your code doesn't use the number 6, but certainly prints it.

I think it is very hard to print 666 without printing a 6. Maybe a solution would be to do a print 999 and ask the user to turn the monitor upside down....

FishMonger
Veteran / Moderator

Nov 21, 2012, 8:17 AM

Post #7 of 8 (3171 views)

Re: [rovf] Perl operator 'x' [In reply to]	Can't Post

Quote

I think it is very hard to print 666 without printing a 6. Maybe a solution would be to do a print 999 and ask the user to turn the monitor upside down....

I like that idea. :o)

Laurent_R
Veteran / Moderator

Nov 21, 2012, 10:18 AM

Post #8 of 8 (3167 views)

Re: [rovf] Perl operator 'x' [In reply to]	Can't Post

Well, yes, I noticed that, but I took it to mean without using 6 in the program. It does not make much sense otherwise.

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