I'm making a standard form calculator (e.g. 7 x 10^5) and I need help thinking of the best method to use.

I basically need the program to take the number/input (say 70000) and then see what multiple of 10 it divides by to give a number between 1 and 9. Like this;

If Input / 1 = 1 or 2 ... or 9 then
output = 0
elseif input / 10 = 1 or 2 ... or 9 then
output = 1
elseif input / 100 = 1 or 2 ... or 9 then
output = 2

(Then, if nothing satisfies...)

if input * 10 = 1 or 2 ... or 9 then
output = -1

I need it to do this and work it out for any size number. What's the best method for this? Some sort of array?

Thanks.

Have you looked up the word Modulus, yet?