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my $i = 0;             # init $i and set to 0
...
print ++$i + ++$i;     # answer: 7 (3 + 4) post-operation -> $i == 7 n
+ow
print ++$i + $i++ + 1; # answer: 17 (7 + 9 + 1) post-operation -> $i =
+= 17 now

perl -Mstrict -e '
my $i = 0;  
...
5
10
14