rotating the digits in a number

Hi guys !
I have to make a program that rotates the digits in a number with k positions to the right. I am not sure if I understand this correctly.
I've found this problem in a book without any details given.
What should I do ? I guess the number is in base 10,not in base 2...What do you think?

It's the same problem in any base.

"1234" in base 10, rotated by 2 is "3412"
"1101" in base 2, rotated by 2 is "0111"