41 lines
976 B
Text
41 lines
976 B
Text
note
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description: "Example of Ackerman function"
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URI: "http://rosettacode.org/wiki/Ackermann_function"
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class
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ACKERMAN_EXAMPLE
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create
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make
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feature {NONE} -- Initialization
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make
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do
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print ("%N A(0,0):" + ackerman (0, 0).out)
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print ("%N A(1,0):" + ackerman (1, 0).out)
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print ("%N A(0,1):" + ackerman (0, 1).out)
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print ("%N A(1,1):" + ackerman (1, 1).out)
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print ("%N A(2,0):" + ackerman (2, 0).out)
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print ("%N A(2,1):" + ackerman (2, 1).out)
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print ("%N A(2,2):" + ackerman (2, 2).out)
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print ("%N A(0,2):" + ackerman (0, 2).out)
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print ("%N A(1,2):" + ackerman (1, 2).out)
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print ("%N A(3,3):" + ackerman (3, 3).out)
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print ("%N A(3,4):" + ackerman (3, 4).out)
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end
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feature -- Access
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ackerman (m: NATURAL; n: NATURAL): NATURAL
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do
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if m = 0 then
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Result := n + 1
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elseif m > 0 and n = 0 then
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Result := ackerman (m - 1, 1)
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elseif m > 0 and n > 0 then
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Result := ackerman (m - 1, ackerman (m, n - 1))
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end
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end
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end
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