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You need to delay the evaluation. Perl calculates each expression as it runs it, so later changes will not change the values already computed:

#!perl -w use strict; my $ini=4; my $last=2; my %result=( SAS1=>$ini-$last, # 2 SAS2=>$last-$ini, # -2 SAS3=>$ini-$last # 2 );

If you want to keep changing $ini and $last, you can do that in a subroutine:

#!perl -w use strict; use Data::Dumper; sub get_SAS { my ($ini,$last) = @_; my %result=( SAS1=>$ini-$last, # 2 SAS2=>$last-$ini, # -2 SAS3=>$ini-$last # 2 ); return %result }; my %res42 = get_SAS(4,2); print Dumper \%res42; my %res105 = get_SAS(10,5); print Dumper \%res105; __END__ $VAR1 = { 'SAS3' => 2, 'SAS2' => -2, 'SAS1' => 2 }; $VAR1 = { 'SAS3' => 5, 'SAS2' => -5, 'SAS1' => 5 };

There are also other ways to delay the calculation, but I think this is the easiest approach.

In reply to Re: Dynamic Hash value by Corion
in thread Dynamic Hash value by Bheema_Tyco

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