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On Wed, 27 Oct 1999, Jean-Yves BARBIER wrote:
> My first table contains <long files names> <size in byte>
> As it comes without ordering on sizes, I want to sort it
> in another hash table, so I make:
> @New_Table = sort { $File_Table{$a} cmp $File_Table{b} } keys %File_Table;
>
> but when I print both tables on the screen, New_Table is empty, why ??!
> (I took it from a book, and also test it with '<=>' instead of 'cmp',
> but I'm still stuck)
Since you're sorting on size, <=> would be the proper operator, since you
want numeric comparisons on the file sizes.
Except for the typo in that $File_Table{b} should be $File_Table{$b}, it
works fine when i plug it into a test program.
Some things to try: run it with the -w option and watch for warnings. Make
sure you're printing @New_Table, and not %New_Table (note that trying to
store a sorted hash into %New_Table wouldn't work, because perl hashes
don't maintain the order of the data). If nothing else, send me the code
off the list and i'll see if i can help you.
- --
finger for PGP public key.
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