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Re: Precision
Posted:
Jan 7, 2013 11:05 PM


On Jan 4, 11:17 pm, Rob Ryan <tio54...@gmail.com> wrote: > My frustration is growing. I simply want to add (for example): > 103971.66+52282.64+2998.27. These are dollars and cents and I'd > like to keep the cents. But when I input that line, I get 159923. > When I input: N[(103971.66+52282.64+2998.27),20] I STILL get 159923. > What do I do to get 159952.57? I've used "SetPrecision", etc. > with still no result. > I note that when I type 103971.66 and hit shiftreturn, the > output is 103972. If I then type "InputForm[%]" I get 103971.66. > > There simply has to be an easy way to add these numbers  > any calculator watch can do it!
If you want the cents to *always* print, use PaddedForm with an explicit request for 2 digits to the right of the decimal point.
s = 103971.66 + 52282.64 + 2998.27 NumberForm[s,8]
159253. 159252.57
t = s + .43 NumberForm[t,8] NumberForm[t,{8,2}] PaddedForm[t,{8,2}]
159253. 159253. 159253. 159253.00



