perl - Initialize hash elements to 0 -


i declare hash in perl doing this:

my %hash = ();

i go on adding elements hashes. sometimes, $hash{$x} not defined, meaning null. when try print it, not anything. expect see 0 in case entry $x not defined. can tell me how do this? how initialize hash elements 0 initially?

instead of trying set default value, can print default value when encounter undefined value using defined-or operator, // (works perl 5.10 , higher).

in example, when print hash elements, either print element, or if not defined, 0:

use 5.010;  $hash{$x} // 0;

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