use System.Diagnostics

class ToThePower

	def main is shared
		.powExpr
		.powAugAssign
#		.time
	
	def powExpr is shared
		for i, answer in [[2, 100], [3, 1_000], [4, 10_000], [5, 100_000]]
			x = 10 ** i
			assert x inherits int  # .warning. The expression is always of type "int"
			assert x == answer
		
		for i, answer in [[2, 4], [3, 8], [4, 16], [5, 32]]
			y = 2 ** i
			assert y inherits int  # .warning. The expression is always of type "int"
			assert y == answer
			
		for j, answerf in [[2f, 9f], [3f, 27f], [4f, 81f], [5f, 243f]]	
			z = 3 ** j
			assert z inherits float  # .warning.  The expression is always of type "float"
			assert z == answerf
			
		f = 1.1f ** 3f  # 1.331
		assert f >= 1.331f and f < 1.3311f
	
		assert 2 ** 0 == 1
		assert 2 ** 1 == 2
	
		assert 2f ** 0f == 1f
		assert 2f ** 1f == 2f
	
		assert 2f ** 0 == 1f
		assert 2f ** 1 == 2f
		assert 2f ** 2 == 4f
		
		assert 2f ** -2 == 0.25f
		expect InvalidOperationException, assert 2 ** -2 == 0
		
		# decimal
		assert 2d ** 0d == 1d
		assert 2d ** 1d == 2d
		
		assert 2d ** 0 == 1d
		assert 2d ** 1 == 2d
		assert 2d ** 2 == 4d
		assert 2d ** -2 == 0.25d

	def powAugAssign is shared
		for i, answer in [[2, 100], [3, 1_000], [4, 10_000], [5, 100_000]]
			x = 10 
			x **= i
			assert x == answer
	
		for j, answerf in [[2f, 9f], [3f, 27f], [4f, 81f], [5f, 243f]]	
			z = 3f
			z **= j
			assert z == answerf
			
		#int raised  int
		y=2
		y **= 0 
		assert y == 1
		y **= 1 
		assert y == 1
		y=2
		y **= 1 
		assert y == 2
		
		# float raised float
		f = 2f
		f **= 0f 
		assert f == 1f
		f **= 1f
		assert f == 1f

		f = 2f
		f **= 1f
		assert f == 2f
		f **= 2f
		assert f == 4f
	
		# float raised int
		f = 2f
		f **= 0 
		assert f == 1f

		f = 2f
		f **= 1
		assert f == 2f
		f **= 2
		assert f == 4f
		
		# {float, int} raised negatives
		f = 2f
		f **= -2
		assert f == 0.25f
		
		y = 2
		expect InvalidOperationException, y **= -2
		
	def time is shared
		count = 1_000_000
		sw = Stopwatch()
		sw.start
		for i in count
			c = 10 ** 3
		sw.stop
		t1 = sw.elapsedMilliseconds
		print t1/count 
		sw.reset
	
		sw.start
		for i in count
			c1 = 10f ** 3f
		sw.stop
		t1 = sw.elapsedMilliseconds
		print t1/count 
		sw.reset
	
/#
		sw.start
		for i in count
			c2 = (10 to float) ** (3 to float)
		sw.stop
		t1 = sw.elapsedMilliseconds
		print t1/count 
#/		
		CobraCore.noOp(c)
		CobraCore.noOp(c1)