FACTORIAL CLUSTER for TOWER EIFFEL

copyright:
	developed by: Nicolas Waquier
	you can use/modify it for you own use, but not redistribute it as 
		library/class/cluster; no restriction about executables.
	if you think this cluster must be improved, let me know; I'll do
		it. You can help if you want.

version: 0.2 94/11
state:
	will be expanded.
	one class is eencoded...
	report every problem.

contain:
	factorial:      the BIG INTEGER class
	f_test:         to test the cluster

target use:
	-Where common numbers (integers, real, double) are not
	appropriate.
	-For big numbers.
	-When one need precision.
	
future change:
	add the missing features (/, Ã).
	make it interoperate with differents compilers.
	add a class with real factorial
	add a class with fractional factorial (rationals)
	add a class with math functions (as in DOUBLE_MATH).
		for that, I need help.
	add a class to join integer with factorial
	add a limit to the size of numbers, when they lost significance.
	
need compiler: Tower Eiffel 1.3.1.0

need clusters: nothing special (kernel)

time to compile:     17 sec Eiffel -> C
test execution time: 13 sec (optimized)
				       1007 sec (non optimized)

development platform: nextstep/486

comment:
" One [of the two missing elements in Eiffel is] numerical precision in floating-point computation (...). A rigorous approach to this problem (...) should be possible (...)"
Extract from ETL (B.Meyer) p.X - Preface.

This cluster is one step in this direction.