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44 lines
1.1 KiB
Plaintext
44 lines
1.1 KiB
Plaintext
# This file is part of NIT ( http://www.nitlanguage.org ).
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#
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# Copyright 2004-2008 Jean Privat <jean@pryen.org>
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# A simple exemple of refinement where a method is added to the integer class.
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module fibonacci
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redef class Int
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# Calculate the self-th element of the fibonacci sequence.
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fun fibonacci: Int
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do
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if self < 2 then
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return 1
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else
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return (self-2).fibonacci + (self-1).fibonacci
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end
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end
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end
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# Print usage and exit.
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fun usage
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do
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print "Usage: fibonnaci <integer>"
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exit 0
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end
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# Main part
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if args.length != 1 then
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usage
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end
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print args.first.to_i.fibonacci
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