On Jan 19, 2009, at 11:57 AM, Brian Slick wrote:
On Jan 19, 2009, at 11:17 AM, mmalc Crawford wrote:
On Jan 19, 2009, at 6:10 AM, julius wrote:
But there is nothing here that looks anything like it would allow
me to intialise with a numeric value like 23.30.
It's not clear why, throughout, you have ignored:
(a) initWithMantissa:exponent:isNegative:
In my case, when I went through almost exactly the same gyration
that julius describes a while ago, I didn't know what a mantissa
was, and I have a decent math and engineering background.
Discussion
The arguments express a number in a type of scientific notation that
requires the mantissa to be an integer. So, for example, if the number
to be represented is 1.23, it is expressed as 123x10^–2—mantissa is
123; exponent is –2; and isNegative, which refers to the sign of the
mantissa, is NO.
<http://developer.apple.com/documentation/Cocoa/Reference/Foundation/Classes/NSDecimalNumber_Class/Reference/Reference.html#//apple_ref/occ/instm/NSDecimalNumber/initWithMantissa:exponent:isNegative:
>
<http://www.google.com/search?hl=en&client=safari&rls=en-us&sa=X&oi=spell&resnum=1&ct=result&cd=1&q=mantissa&spell=1
>
-> <http://en.wikipedia.org/wiki/Significand>
mmalc
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