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fibonacci.e
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1998-12-22
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-- This file is part of SmallEiffel The GNU Eiffel Compiler.
-- Copyright (C) 1994-98 LORIA - UHP - CRIN - INRIA - FRANCE
-- Dominique COLNET and Suzanne COLLIN - colnet@loria.fr
-- http://www.loria.fr/SmallEiffel
-- SmallEiffel is free software; you can redistribute it and/or modify it
-- under the terms of the GNU General Public License as published by the Free
-- Software Foundation; either version 2, or (at your option) any later
-- version. SmallEiffel is distributed in the hope that it will be useful,but
-- WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
-- for more details. You should have received a copy of the GNU General
-- Public License along with SmallEiffel; see the file COPYING. If not,
-- write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-- Boston, MA 02111-1307, USA.
--
class FIBONACCI
creation make
feature
make is
do
if argument_count /= 1 or else
not argument(1).is_integer
then
io.put_string("Usage: ");
io.put_string(argument(0));
io.put_string(" <Integer_value>%N");
die_with_code(exit_failure_code);
end;
io.put_integer(fibonacci(argument(1).to_integer));
io.put_new_line;
end;
fibonacci(i: INTEGER): INTEGER is
require
i >= 0
do
if i = 0 then
Result := 1;
elseif i = 1 then
Result := 1;
else
Result := fibonacci(i - 1) + fibonacci(i - 2) ;
end;
end;
end