Creating BigInteger from String

Question

How to get rid of Integer.parseInt in the line:

 BigInteger i = BigInteger.valueOf(Integer.parseInt(factorial(n - 1)) * n);

The method has the form String factorial(int n) .

Generally speaking, calculating factorial is recursive, although it is customary for many, but incorrectly - because it is the most obvious example of recursion, it is often given in different textbooks (but only as an example!).
So if you are doing non-task-to-recursion, use a normal loop.
@ 0xFFh considering that the author’s factorial method returns a String , then, apparently, it’s all clear what’s going on in this method, which is absolutely not connected with the optimal way of finding the factorial of a number.

Mikhail Vaysman Mikhail Vaysman 13.6k one 13 28 · Accepted Answer · 2017-01-02T19:24:26

like this

 BigInteger i = new BigInteger(factorial(n));

Jvic jvic 2,148 7 27 · Answer 2 · 2017-01-02T19:24:21

to fix String factorial(int n) on BigInteger factorial(int n)

2 answers 2