>Would you do this: 5' 10.5" ?

I would find this acceptable, but if you wish to market it
you may need to have it as 5ft 10.5in

Otherwise I would also say that decimal inches should be OK, but if
fractions are insisted on, then do it in quarters of an inch, that way you
only have to display 3 possible fractions, vis 1/4, 1/2 and 3/4, which you
could probably do acceptably by coding special characters. If smaller
fractions are wanted, I would not go below eighths, and if you wanted these
as special characters you may have to go to a graphical display, or program
on the fly as I have a feeling there are only 6 extra programmable
characters (I may be wrong here) on a 448xx type driver chip and you would
need 7.

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