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  1. or download this
    use strict;
use warnings;
...
my $cc=\&add; 

print $cc."\n";
  2. or download this
    Sum within function: 11
SCALAR(0x3f7e24)
CODE(0xa3e58c)
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    use strict;
use warnings;
...
aa();
  4. or download this
    Sum within function: 11
Value of count in subroutine  1
...
Sum within function: 25
Value of count in subroutine  4
Multi : 2000