0
// Iterative solution
public static final long iterativeFactorial(final long n) {
long factorial = 1;
for (long i = 1; i <= n; i++) {
factorial *= i;
}
return factorial;
}
// Recursive solution
public static final long recursiveFactorial(final long n) {
if (n <= 1) {
return n;
}
return n * recursiveFactorial(n - 1);
}
// Arbitrary length solution - may take a while, but works on any positive number.
public static final BigInteger factorial(final BigInteger n) {
BigInteger factorial = BigInteger.ONE;
for (BigInteger i = BigInteger.ONE; i.compareTo(n) <= 0; i = i.add(BigInteger.ONE)) {
factorial = factorial.multiply(i);
}
return factorial;
}
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