Change of base

In numeral systems, the radix or base is the number of unique digits, including zero, that a numeral system uses to represent numbers. For example, for the decimal system (the most common system in use today) the radix is ten, because it uses the ten digits from 0 through 9. And hence, in such a number system 9 is followed by 10 , 11 and so on. Your task is to rite a program that converts a number