func(2) means num = 2, so the for loop will execute twice.
First iteration (_ = 0):
res starts as '*'.
res += res doubles res, resulting in res = '**'.
Second iteration (_ = 1):
res is currently '**'.
res += res doubles res again, resulting in res = '****'.
After the loop completes, func(2) returns the string '****'.
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mldprasad
1 week, 6 days ago