how to calculate a numeric's digits count?

I am baffled. I think those were English words but they didn't make any sense to me. Not was there a reproducible example to turn to. Can you try again?
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Sent from my phone. Please excuse my brevity.

Dear usRers,
? Now i want to cal ,e.g. 
?cal(1.234)? will get 3
?cal(1) will get 0
?cal(1.3045) will get 4
?But the difficult part is cal(1.3450) will get 4 not 3.
So, is there anyone happen to know the solution to this problem, or it
can't be solved in R, because 1.340 will always be transformed autolly
to 1.34?






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PO SU
mail: desolator88 at 163.com 
Majored in Statistics from SJTU

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