1) on line 2, a
string buffer (s) of capacity 16 + 5 = 21 is created.
2) on line 3, we appended ss to s making 16 + 5 = 21, which fits perfectly in s, making the output on line 4 equals to 21.
my question is: if we add another character to ss
the output (capcity) of s becomes 44 !!! isn't suppose that the capacity increases by one, hence becoming 22??