-- This file is part of a Liberty Eiffel library.
-- See the full copyright at the end.
--
deferred class INTEGER_GENERAL_NUMBER
   --
   -- To implement NUMBER (do not use this class, see NUMBER).
   --

inherit
   NUMBER
      redefine abs
      end

feature {ANY}
   abs: INTEGER_GENERAL_NUMBER
      do
         if is_negative then
            Result ::= -Current
         else
            Result := Current
         end
      end

   factorial: NUMBER
      do
         if is_zero or else is_one then
            Result := one
         else
            from
               put_into_mutable_big_integer(mutable_register1)
               mutable_register2.copy(mutable_register1)
               mutable_register3.from_integer(2)
            until
               mutable_register3.is_equal(mutable_register2)
            loop
               mutable_register1.multiply(mutable_register3)
               mutable_register3.add_integer(1)
            end
            Result := mutable_register1.to_integer_general_number
         end
      end

   numerator: INTEGER_GENERAL_NUMBER
      do
         Result := Current
      end

   denominator: INTEGER_GENERAL_NUMBER
      do
         Result := integer_general_number_one
      end

feature {ANY}
   append_decimal_in (buffer: STRING; digits: INTEGER; all_digits: BOOLEAN)
      local
         n: INTEGER
      do
         append_in(buffer)
         if all_digits then
            from
               buffer.extend('.')
            until
               n >= digits
            loop
               buffer.extend('0')
               n := n + 1
            end
         end
      end

feature {NUMBER} -- Implementation:
   integer_divide_integer_64_number (other: INTEGER_64_NUMBER): INTEGER_GENERAL_NUMBER
      require
         other /= Void
      deferred
      ensure
         Result /= Void
      end

   remainder_of_divide_integer_64_number (other: INTEGER_64_NUMBER): INTEGER_GENERAL_NUMBER
      require
         other /= Void
      deferred
      ensure
         Result /= Void
      end

   integer_divide_big_integer_number (other: BIG_INTEGER_NUMBER): INTEGER_GENERAL_NUMBER
      require
         other /= Void
      deferred
      ensure
         Result /= Void
      end

   remainder_of_divide_big_integer_number (other: BIG_INTEGER_NUMBER): INTEGER_GENERAL_NUMBER
      require
         other /= Void
      deferred
      ensure
         Result /= Void
      end

feature {NUMBER} -- Implementation:
   gcd_with_big_integer_number (other: BIG_INTEGER_NUMBER): INTEGER_GENERAL_NUMBER
      do
         put_into_mutable_big_integer(mutable_register1)
         other.put_into_mutable_big_integer(mutable_register2)
         mutable_register1.gcd(mutable_register2)
         Result := mutable_register1.to_integer_general_number
      end

feature {NUMBER}
   put_into_mutable_big_integer (mut: MUTABLE_BIG_INTEGER)
      require
         mut /= Void
      deferred
      ensure
         mut.to_integer_general_number.is_equal(Current)
      end

feature {INTEGER_GENERAL_NUMBER}
   integer_general_number_zero: INTEGER_GENERAL_NUMBER
      once
         Result ::= zero
      ensure
         Result.is_zero
      end

   integer_general_number_one: INTEGER_GENERAL_NUMBER
      once
         Result ::= one
      ensure
         Result.is_one
      end

   integer_general_number_one_negative: INTEGER_GENERAL_NUMBER
      once
         Result ::= -integer_general_number_one
      ensure
         (-Result).is_one
      end

end -- class INTEGER_GENERAL_NUMBER
--
-- Copyright (C) 2009-2017: by all the people cited in the AUTHORS file.
--
-- Permission is hereby granted, free of charge, to any person obtaining a copy
-- of this software and associated documentation files (the "Software"), to deal
-- in the Software without restriction, including without limitation the rights
-- to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-- copies of the Software, and to permit persons to whom the Software is
-- furnished to do so, subject to the following conditions:
--
-- The above copyright notice and this permission notice shall be included in
-- all copies or substantial portions of the Software.
--
-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-- AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-- LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-- OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-- THE SOFTWARE.