formline, undefined format STDOUT

Anonymous Monk has asked for the wisdom of the Perl Monks concerning the following question:

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Re: formline, undefined format STDOUT by choroba (Cardinal) on Apr 20, 2015 at 13:19 UTC
formline is low level function. As shown in perlformat, you have to use it with $^A (which you could also localize): `formline( "@<< @<< @<<", '1', '2', '2' ); print "$^A\n";` [download] or specify an empty format before: `format = . formline( "@<< @<< @<<", '1', '2', '2' ); write;` [download] Use a higher level format: `format = @<< @<< @<< 1, 2, 2 . write;` [download] Or, switch to plain sprintf: `say join ' ', map sprintf('%-3d', $_), 1, 2, 2;` [download] لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ	[reply] [d/l] [select]
Re^2: formline, undefined format STDOUT by Anonymous Monk on Apr 20, 2015 at 14:47 UTC
lets say there are two fields, one of them is long and other one is small. Whats the ways to print all the contents `$l = "This is long string" ; $s = "s"; format STDOUT = ~~ @<<< @< $l, $s .` [download] above is not working.	[reply] [d/l]
Re^3: formline, undefined format STDOUT by choroba (Cardinal) on Apr 20, 2015 at 15:17 UTC
As documented in perlform, `~~` should be used for changing values that finally become undefined. `#!/usr/bin/perl use warnings; use strict; my @l = ('This is long string', 'Another long one'); my @s = ('s', 'S'); format = ~~ @<<<<<<<<<<<<<<<<<<< @< shift @l, shift @s . write;` [download] It's time you read the documentation again. I've never used formats in Perl, and I hope I never will; but I was able to put this together in one minute. لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ	[reply] [d/l] [select]
Re^4: formline, undefined format STDOUT by Anonymous Monk on Apr 20, 2015 at 17:23 UTC
Re: formline, undefined format STDOUT by kcott (Archbishop) on Apr 20, 2015 at 13:15 UTC
Take a look at the documentation for formline. Note what it says about using double quotes. Your use of double quotes is very likely the cause of your problem. -- Ken	[reply]
Re: formline, undefined format STDOUT by toolic (Bishop) on Apr 20, 2015 at 13:12 UTC
Perhaps write requires that you use format instead of just formline. Read perlform. Consider using the simpler printf.	[reply]
Re: formline, undefined format STDOUT by ikegami (Patriarch) on Apr 20, 2015 at 17:17 UTC
Since you're just starting out with forms, you might want to consider using the far better Perl6::Form (Perl6-style forms for Perl5) instead.	[reply]
Re^2: formline, undefined format STDOUT by jeffa (Bishop) on Apr 20, 2015 at 17:34 UTC
Or how about Mustache? jeffa L-LL-L--L-LL-L--L-LL-L-- -R--R-RR-R--R-RR-R--R-RR B--B--B--B--B--B--B--B-- H---H---H---H---H---H--- (the triplet paradiddle with high-hat)	[reply] [d/l]
Re^3: formline, undefined format STDOUT by ikegami (Patriarch) on Apr 20, 2015 at 18:38 UTC
That's a templating system, not a text formatter. It doesn't perform the same task at all.	[reply]