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	description: "[
		Basic mathematical operations, double-precision.
		This class may be used as ancestor by classes needing its facilities.
	]"
	status: "See notice at end of class"
	date: "$Date: 2001-11-16 20:32:23 +0000 (Fri, 16 Nov 2001) $"
	revision: "$Revision: 51435 $"

class 
	DOUBLE_MATH

feature -- Access

	arc_cosine (v: DOUBLE): DOUBLE is
			-- Trigonometric arccosine of radian v
			-- in the range [0, pi]
		external
			"C | <math.h>"
		alias
			"acos"
		end

	arc_sine (v: DOUBLE): DOUBLE is
			-- Trigonometric arcsine of radian v
			-- in the range [-pi/2, +pi/2]
		external
			"C | <math.h>"
		alias
			"asin"
		end

	arc_tangent (v: DOUBLE): DOUBLE is
			-- Trigonometric arctangent of radian v
			-- in the range [-pi/2, +pi/2]
		external
			"C | <math.h>"
		alias
			"atan"
		end

	ceiling (v: DOUBLE): DOUBLE is
			-- Least integral greater than or equal to v
		external
			"C | <math.h>"
		alias
			"ceil"
		end

	cosine (v: DOUBLE): DOUBLE is
			-- Trigonometric cosine of radian v approximated
			-- in the range [-pi/4, +pi/4]
		external
			"C | <math.h>"
		alias
			"cos"
		end

	dabs (v: DOUBLE): DOUBLE is
			-- Absolute of v
		external
			"C | <math.h>"
		alias
			"fabs"
		end

	exp (x: DOUBLE): DOUBLE is
			-- Exponential of v.
		external
			"C | <math.h>"
		end

	floor (v: DOUBLE): DOUBLE is
			-- Greatest integral less than or equal to v
		external
			"C | <math.h>"
		end

	log (v: DOUBLE): DOUBLE is
			-- Natural logarithm of v
		external
			"C | <math.h>"
		end

	log10 (v: DOUBLE): DOUBLE is
			-- Base 10 logarithm of v
		external
			"C | <math.h>"
		end

	log_2 (v: DOUBLE): DOUBLE is
			-- Base 2 logarithm of v
		local
			a: DOUBLE
		do
			a := 2.0
			Result := log (v) / log (a)
		end

	sine (v: DOUBLE): DOUBLE is
			-- Trigonometric sine of radian v approximated
			-- in range [-pi/4, +pi/4]
		external
			"C | <math.h>"
		alias
			"sin"
		end

	sqrt (v: DOUBLE): DOUBLE is
			-- Square root of v
		external
			"C | <math.h>"
		end

	tangent (v: DOUBLE): DOUBLE is
			-- Trigonometric tangent of radian v approximated
			-- in range [-pi/4, +pi/4]
		external
			"C | <math.h>"
		alias
			"tan"
		end
	
feature {NONE} -- Access

	Euler: DOUBLE is 2.7182818284590452354
			-- Logarithm base
			-- (from MATH_CONST)

	Pi: DOUBLE is 3.14159265358979323846
			-- (from MATH_CONST)

	Sqrt2: DOUBLE is 1.41421356237309504880
			-- Square root of 2
			-- (from MATH_CONST)
	
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 DOUBLE_MATH


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