Input Box Number

Hi !
My problem is:
In the input box of my prg i put an 8 digits number. I would like take separately any number so I can to do:
Dn*2^n Where D=Digit and n=sequence of digit.
For example (with an 6 digits no):
3 1 3 8 0 2
/ / / / / /
31*2^3 12*2^1 33*2^3 84*2^4 05*2^5 26*2^2

Thanks in advance.

look into the charAt() function