12-e1-starString

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Exercise 12.1: starString

Added by: Whitaker Brand on 2010/05/16

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 n^th 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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