> How can I recall only certain keys and their corresponding values of hashes
> ex : if D_103 then print " D_103 value is 2"
> ex :if D_101 then print "D_101 value is  0"

You may be looking for this:

  print "$_ value is $mycoolhash{$_}\n" if exists($mycoolhash{$_});

or more classically:

if (exists($mycoolhash{$_})) {
  print "$_ value is $mycoolhash{$_}\n";
} 

- B



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