why doesn't this code work

Question

a function to calculate factorial, but it throws an exception when n is above 12 or below 0
https://code.sololearn.com/cVU8xHE8m69F/?ref=app

Answer 1

public int factorial(int n) throws IllegalArgumentException {
int factorial = 0;

if (n>12 || n<0){ throw new IllegalArgumentException(); }
else {
factorial = 1;
for (int i=n;i>=1;i--){
factorial *= i;
}

}

return factorial;
}
}

please try this function

Answer 2

1) you should put a semi-colon at end of all statements (missing one at end of IllegalArgumentException())

2) you must declare int factorial outside of if block to be accessible to return statement ^^