Fraction length

Question

How to get the fraction length? If at all possible, without using string operation or loop

should all return length of 3:
5.234
5.23400
5.234000

Any programming language is accepted

[EDIT]

Not a homework, I want to display fractions at its minimum. Example, I defined numeric(18,8) in database. If the user entered only 5.234, the data saved in database is 5.23400000. I just want to display it back as 5.234 only

Answer 1

If Int(num) = num Then Return 0
num *= 10
If Int(num) = num Then Return 1
num *= 10
If Int(num) = num Then Return 2
num *= 10
If Int(num) = num Then Return 3
num *= 10
If Int(num) = num Then Return 4
num *= 10
If Int(num) = num Then Return 5
num *= 10
If Int(num) = num Then Return 6
num *= 10
If Int(num) = num Then Return 7
num *= 10
If Int(num) = num Then Return 8
Throw New Exception("Number exceeds expected precision")

No string operations, no loops.

EDIT:

BTW, to do this with a loop:

result = 0
Do While (Int(num) !> num) 
    num *= 10
    result += 1
Loop
Return result

Slightly more elegant