Output: Use of uninitialized value $test1 in concatenation (.) or string at test.pl line 19. test1 after hash assignment: i = 0 test1 after defaulting to i: 0 test1 after hash assignment: 0 i = 1 test1 after defaulting to i: 0 test1 after hash assignment: 0 i = 2 test1 after defaulting to i: 0 test1 after hash assignment: 0 i = 3 test1 after defaulting to i: 0