On Tue, 13 Apr 2010 05:35:51 +0200
Magne Sandøy <msan...@gmail.com> wrote:
> Hi.
>
> I'm new to perl, and I stumbled across a strange behavior in my for
> loop. In the following code, the second for loop actually counts way
> passed what I expected, and actually stops at "yz" and not "z" as
> expected. As shown by the third for loop, incrementing the letters,
> seems to give me the desired output in each loop.
> What is going on here?
>
>
> #!/usr/bin/perl
> use warnings;
> use strict;
>
> my $letter = "u";
>
> for ("u".."z"){
> print " $_ ";
> }
>
> print "\n\n";
>
> for ($_="u"; $_ le "z"; $_++){
> print " $_ ";
> }
>
In the above, when $_ gets to 'y' it is less than 'z' so it
auto increments to 'z', then when the next comparison is made, it is
equal to 'z' and so increments again.
I suspect auto increment is different for letters and numbers
> print "\n\n";
>
> for(1..7){
> print " $letter ";
> $letter++;
> }
Which goes to show that the thing after 'z' is 'aa' using the
auto increment
Owen
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