Check the prototype : prototype « Subroutine « Perl

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Perl » Subroutine » prototype 




Check the prototype
   

#!/usr/bin/perl

use strict;
use warnings;

sub add_two ($$) {
    return $_[0]+$_[1];
}

print prototype(\&add_two),"\n"; # produces '$$'
print prototype('add_two'),"\n"; # likewise

   
    
    
  














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