indexing
	description: "Some useful facilities on objects of basic types"
	status: "See notice at end of class"
	date: "$Date$"
	revision: "$Revision$"

class interface
	BASIC_ROUTINES

feature -- Conversion

	charconv (i: INTEGER): CHARACTER
			-- Character corresponding to ascii code i
	
feature -- Basic operations

	abs (n: INTEGER): INTEGER
			-- Absolute value of n
		ensure
			non_negative_result: Result >= 0

	bottom_int_div (n1, n2: INTEGER): INTEGER
			-- Greatest lower bound of the integer division of n1 by n2

	rsign (r: REAL): INTEGER
			-- Sign of r:
			-- -1 if r < 0
			--  0 if r = 0
			-- +1 if r > 0
		ensure
			correct_negative: (r < 0) = (Result = - 1)
			correct_zero: (r = 0) = (Result = 0)
			correct_positive: (r > 0) = (Result = + 1)

	sign (n: INTEGER): INTEGER
			-- Sign of n:
			-- -1 if n < 0
			--  0 if n = 0
			-- +1 if n > 0
		ensure
			correct_negative: (n < 0) = (Result = - 1)
			correct_zero: (n = 0) = (Result = 0)
			correct_positive: (n > 0) = (Result = + 1)

	up_int_div (n1, n2: INTEGER): INTEGER
			-- Least upper bound of the integer division
			-- of n1 by n2
	
invariant

		-- from ANY
	reflexive_equality: standard_is_equal (Current)
	reflexive_conformance: conforms_to (Current)

indexing
	library: "[
			EiffelBase: Library of reusable components for Eiffel.
	]"
	status: "[
			Copyright 1986-2001 Interactive Software Engineering (ISE).
			For ISE customers the original versions are an ISE product
			covered by the ISE Eiffel license and support agreements.
	]"
	license: "[
			EiffelBase may now be used by anyone as FREE SOFTWARE to
			develop any product, public-domain or commercial, without
			payment to ISE, under the terms of the ISE Free Eiffel Library
			License (IFELL) at http://eiffel.com/products/base/license.html.
	]"
	source: "[
			Interactive Software Engineering Inc.
			ISE Building
			360 Storke Road, Goleta, CA 93117 USA
			Telephone 805-685-1006, Fax 805-685-6869
			Electronic mail <info@eiffel.com>
			Customer support http://support.eiffel.com
	]"
	info: "[
			For latest info see award-winning pages: http://eiffel.com
	]"

end -- class BASIC_ROUTINES