Aminet 37/Aminet 37 (2000)(Schatztruhe)[!][Jun 2000].iso/Aminet/dev/lang/sofa.lha/sofa/smalleiffel/lib_number/large_negative_integer.e

Text File | 2000-03-25 | 10KB | 401 lines

-- This file is  free  software, which  comes  along  with  SmallEiffel. This
-- software  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. You can modify it as you want, provided
-- this header is kept unaltered, and a notification of the changes is added.
-- You  are  allowed  to  redistribute  it and sell it, alone or as a part of
-- another product.
--          Copyright (C) 1994-98 LORIA - UHP - CRIN - INRIA - FRANCE
--            Dominique COLNET and Suzanne COLLIN - [e-mail]
--                       http://SmallEiffel.loria.fr
--
class LARGE_NEGATIVE_INTEGER
--
-- To implement NUMBER (do not use this class, see NUMBER).
--

inherit LARGE_INTEGER;

creation make_from_fixed_array, make_smaller, make_from_product, make_big

feature

   is_positive: BOOLEAN is false;

   is_negative: BOOLEAN is true;

   to_integer: INTEGER is
      do
     Result := Minimum_integer;
      end;

   to_double: DOUBLE is
      do
     Result := - fixed_array_to_double(value);
      end;

   prefix "-": NUMBER is
      do
     !LARGE_POSITIVE_INTEGER!Result.make_from_fixed_array(value);
      end;


   infix "+" (other: NUMBER): NUMBER is
      do
     Result := other.add_with_large_negative_integer(Current);
      end;

   infix "@+" (other: INTEGER): NUMBER is
      do
     if (other = 0 ) then
        Result := clone( Current )
     elseif (other > 0) then
        temp_1_digint.put(other, 0);
        difference_between_fixed_arrays(value, temp_1_digint);
        Result := create_negative(temp);
     else
        if (other /= Minimum_integer) then
           temp_1_digint.put(other.abs, 0);
           add_fixed_arrays(value, temp_1_digint);

        else
           temp_2_digints.put(0,0);
           temp_2_digints.put(1,1);
           add_fixed_arrays(value, temp_2_digints);
        end;
        !LARGE_NEGATIVE_INTEGER!Result.make_from_fixed_array(clone(temp));
     end;
      end;

   infix "*" (other: NUMBER): NUMBER is
      do
     Result := other.multiply_with_large_negative_integer(Current);
      end;

   infix "@*"(other : INTEGER): NUMBER is
      do
     if (other = 0) then
        Result := zero;
     elseif (other > 0) then
        mult_fixed_with_integer(value, other);
        !LARGE_NEGATIVE_INTEGER!Result.make_from_fixed_array(clone(temp));
     else
        if (other = Minimum_integer) then
           mult_2_fixed(value, smaller_correct_fixed);
           !LARGE_POSITIVE_INTEGER!Result.make_from_fixed_array(clone(temp_from_mult));
        else
           mult_fixed_with_integer(value, other.abs);
           !LARGE_POSITIVE_INTEGER!Result.make_from_fixed_array(clone(temp));
        end;
     end;
      end;

   infix "@/" (other: INTEGER): NUMBER is
      require
     other /= 0;
      local
     d: ABSTRACT_INTEGER;
      do
     if (other = 1) then
        Result := Current;
     elseif (other = -1) then
        Result := -Current;
     else
        !SMALL_INTEGER!d.make(other);
        Result := Current / d;
     end;
      end;

   infix "//" (other: NUMBER): NUMBER is
      local
     oth: ABSTRACT_INTEGER;
      do
     oth ?= other;
     Result := oth.integer_divide_large_negative_integer(Current);
      end;

   infix "@//" (other: INTEGER): NUMBER is
      do
     if (other = Minimum_integer) then
        divise_fixed_array(value, smaller_correct_fixed);
        Result := create_positive(temp_quotient);
     else
        temp_1_digint.put(other.abs,0);
        divise_fixed_array(value, temp_1_digint);
        if (other < 0) then
           Result := create_positive(temp_quotient);
        else
           Result := create_negative(temp_quotient);
        end;
     end;
      end;

   infix "\\" (other: NUMBER): NUMBER is
      local
     oth: ABSTRACT_INTEGER;
      do
     oth ?= other;
     Result := oth.remainder_of_divide_large_negative_integer(Current);
      end;

feature {NUMBER}

   add_with_large_positive_integer(other: LARGE_POSITIVE_INTEGER): NUMBER is
      do
     Result := other.add_with_large_negative_integer(Current);
      end;

   add_with_large_negative_integer(other: LARGE_NEGATIVE_INTEGER): NUMBER is
      do
     add_fixed_arrays(value, other.value);
     !LARGE_NEGATIVE_INTEGER!Result.make_from_fixed_array(clone(temp));
      end;

   add_with_small_fraction(other: SMALL_FRACTION): NUMBER is
      do
     Result := other.add_with_large_negative_integer( Current );
      end;

   add_with_large_fraction(other: LARGE_FRACTION): NUMBER is
      do
     Result := other.add_with_large_negative_integer( Current );
      end;

   multiply_with_large_positive_integer(other: LARGE_POSITIVE_INTEGER): NUMBER is
      do
    Result := other.multiply_with_large_negative_integer( Current );
      end;

   multiply_with_large_negative_integer(other: LARGE_NEGATIVE_INTEGER): NUMBER is
      do
     mult_2_fixed(value, other.value);
     !LARGE_POSITIVE_INTEGER!Result.make_from_fixed_array(clone(temp_from_mult));
      end;

   multiply_with_small_fraction (other: SMALL_FRACTION): NUMBER is
      do
     Result := other.multiply_with_large_negative_integer(Current);
      end;

   multiply_with_large_fraction (other: LARGE_FRACTION): NUMBER is
      do
     Result := other.multiply_with_large_negative_integer(Current);
      end;

   integer_divide_small_integer(other: SMALL_INTEGER): ABSTRACT_INTEGER is
      do
     if (other @= Minimum_integer) then
        divise_fixed_array(smaller_correct_fixed, value);
        Result := create_positive(temp_quotient);
     else
        temp_1_digint.put(other.to_integer.abs,0);
        divise_fixed_array(temp_1_digint, value);
        if (other @< 0) then
           Result := create_positive(temp_quotient);
        else
           Result := create_negative(temp_quotient);
        end;
     end;
      end;

   integer_divide_large_positive_integer(other: LARGE_POSITIVE_INTEGER): ABSTRACT_INTEGER is
      do
     divise_fixed_array(other.value, value);
     Result := create_negative(temp_quotient);
      end;

   integer_divide_large_negative_integer(other: LARGE_NEGATIVE_INTEGER): ABSTRACT_INTEGER is
      do
     divise_fixed_array(other.value, value);
     Result := create_positive(temp_quotient);
      end;

   remainder_of_divide_small_integer(other: SMALL_INTEGER): ABSTRACT_INTEGER is
      do
     if (other @= Minimum_integer) then
        divise_fixed_array(smaller_correct_fixed, value);
        Result := create_negative(temp_remainder);
     else
        temp_1_digint.put(other.to_integer.abs,0);
        divise_fixed_array(temp_1_digint, value);
        if (other @< 0) then
           Result := create_negative(temp_remainder);
        else
           Result := create_positive(temp_remainder);
        end;
     end;
      end;

   remainder_of_divide_large_positive_integer(other: LARGE_POSITIVE_INTEGER): ABSTRACT_INTEGER is
      do
     divise_fixed_array(other.value, value);
     Result := create_positive(temp_remainder);
      end;

   remainder_of_divide_large_negative_integer(other: LARGE_NEGATIVE_INTEGER): ABSTRACT_INTEGER is
      do
     divise_fixed_array(other.value, value);
     Result := create_negative(temp_remainder);
      end;

   infix "@\\" (other: INTEGER): NUMBER is
      do
     if (other = Minimum_integer) then
        divise_fixed_array(value, smaller_correct_fixed);
        Result := create_negative(temp_remainder);
     else
        temp_1_digint.put(other.abs,0);
        divise_fixed_array(value, temp_1_digint);
        if (other < 0) then
           Result := create_negative(temp_remainder);
        else
           Result := create_positive(temp_remainder);
        end;
     end;
      end;


feature {NUMBER} -- inverse

   inverse: NUMBER is
      local
     num: SMALL_INTEGER;
     den: LARGE_POSITIVE_INTEGER;
      do
     den ?= abs;
     num ?= one;
     !LARGE_FRACTION!Result.make_simply(num, den, true);
      end;


feature -- Comparisons with INTEGER

   infix "@=" (other: INTEGER): BOOLEAN is
      do
         if (other = Minimum_integer) then
        Result := ((value.upper = 1)
               and then (value.item(1) = 1)
               and then (value.item(0) = 0));
     else
     end;
      end;

   infix "@<" (other: INTEGER): BOOLEAN is
      do
         Result := (other /= Minimum_integer) or else not( same_as(greater_large_negative_integer) );
      end;

   infix "@>" (other: INTEGER): BOOLEAN is
      do
      end;

   infix "@<=" (other: INTEGER): BOOLEAN is
      do
     Result := true
      end;

   infix "@>=" (other: INTEGER): BOOLEAN is
      do
     Result := Current @= other
      end;

feature -- Comparisons with NUMBER

      infix "<" (other: NUMBER): BOOLEAN is
      do
     Result := other.greater_with_large_negative_integer(Current);
      end

feature -- Comparisons with DOUBLE

   infix "#=" (other: DOUBLE): BOOLEAN is
      do
     if other > Minimum_integer then
     else
        Result := to_double = other;
     end;
      end;

   infix "#<" (other: DOUBLE): BOOLEAN is
      do
     if other > Minimum_integer then
        Result := true
     else
        Result := to_double < other;
     end;
     end;

   infix "#<=" (other: DOUBLE): BOOLEAN is
      do
     if other > Minimum_integer then
        Result := true
     else
        Result := to_double <= other;
     end;
      end;

   infix "#>" (other: DOUBLE): BOOLEAN is
      do
     if other > Minimum_integer then
     else
        Result := to_double > other;
     end;
      end;

   infix "#>=" (other: DOUBLE): BOOLEAN is
      do
     if other > Minimum_integer then
     else
        Result := to_double >= other;
     end;
      end;

feature{NUMBER}

   greater_with_large_positive_integer(other: LARGE_POSITIVE_INTEGER): BOOLEAN is
      do
      end;

   greater_with_large_negative_integer(other: LARGE_NEGATIVE_INTEGER): BOOLEAN is
      local
     i: INTEGER;
      do
     if (value.upper = other.value.upper) then
        from
           i := value.upper;
        variant
           i
        until
            (i < value.lower) or else (value.item(i) /= other.value.item(i))
        loop
           i := i - 1;
        end;
        Result := (i /= value.lower - 1)
           and then (value.item(i) < other.value.item(i));
     else
        Result := (value.upper < other.value.upper);
     end;
      end;

   greater_with_small_fraction(other: SMALL_FRACTION): BOOLEAN is
      do
      end;

   greater_with_large_fraction(other: LARGE_FRACTION): BOOLEAN is
      do
        Result := not(other.greater_with_large_negative_integer(Current));
      end;


end -- LARGE_NEGATIVE_INTEGER