How can i get this program running well

Question

i tried to implement a getFactorial method using BigInteger but i get some compiler exceptions
https://code.sololearn.com/c59YkpgVVMn7/?ref=app

Answer 1

1. Import BigInteger class from math:
import java.math.BigInteger;

2. You need to return a BigInteger, because you can't convert type int to BigInteger:
return n.equals(0) ? 1 : n.multiply(...);

return n.equals(new BigInteger("0")) ? new BigInteger("1") : n.multiply(...);

Answer 2

Boris Batinkov thanks alot bro...it worked