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BJP3 Exercise 12.1: starString

Added by: Whitaker Brand on 2013/04/01
Keywords: recursion

Write a method starString that accepts an integer parameter n and returns a string of stars (asterisks) 2n long (i.e., 2 to the nth power). For example:

Call Output Reason
starString(0); "*" 20 = 1
starString(1); "**" 21 = 2
starString(2); "****" 22 = 4
starString(3); "********" 23 = 8
starString(4); "****************" 24 = 16

You should throw an IllegalArgumentException if passed a value less than 0.

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