Difficulty with BigInteger

Question

I am trying to do Factorial with Recursion and BigIntegers but eclipse is complaining about the BigInteger. I know the program is supposed to be simple but it is giving me h

Answer 1

In addition to what @aix mentioned regarding invoking the arithmetics on BigInteger - I can also see another issue with this code.

Your method signature is

public static  int fact(BigInteger n)

This is problemantic - factorial grows fast, so you are very likely to overflow the result.
I think what you realy wanted is:

public static  BigInteger fact(int n)

which makes much more sense, since the return value should probably be the BigInteger (since it grows fast) and not the parameter, or possibly - both of them.