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Re^3: Format, empty vars, and fixed-width records

by BrowserUk (Patriarch)
on Apr 22, 2008 at 00:14 UTC ( #682057=note: print w/replies, xml ) Need Help??

in reply to Re^2: Format, empty vars, and fixed-width records
in thread Format, empty vars, and fixed-width records

As I showed with the decimal field at the beginning of the records above, you can truncate integer fields by using %N.Ns. Unfortunately, the truncation always occurs on the right regardless of whether you use '-' or not:

[0] Perl> printf "%2.2s\n", $_ for 9, 99 .. 101;; 9 99 10 10 [0] Perl> printf "%-2.2s\n", $_ for 9, 99 .. 101;; 9 99 10 10

Which may not be what you want. The real problem (sic) is floating point numbers, there's just no sensible way to squeeze them into a fixed width field if they stray beyond a limited range:

printf "%-8.8s\n", sprintf '%8f', $_ for map{ 1.23456789 * $_} map{ "1e$_" } -10 .. 10;; 0.000000 0.000000 0.000000 0.000000 0.000001 0.000012 0.000123 0.001235 0.012346 0.123457 1.234568 12.34567 123.4567 1234.567 12345.67 123456.7 1234567. 12345678 12345678 12345678 12345678

And its worse if you want or need to maintain point alignment.

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Re^4: Format, empty vars, and fixed-width records
by ikegami (Patriarch) on Apr 22, 2008 at 02:56 UTC

    You could handle number overflow like Excel does:

    sub format_num { my $s = sprintf('%5.2f', $_[0]); return length($s) > 5 ? 'XXXXX' : $s; }

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