Factorial java return 0

Question

I made a simple function to calculate the factorial of a number but from number 34 returns 0 . It should be from number 51 .

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Answer 1

Java int is a primitive signed type stored in 32-bits, that means it has a valid range of -2³¹ to 2³¹-1 (see also Integer.MIN_VALUE and Integer.MAX_VALUE). In Java 8+ you might calculate the factorial using lambdas and taking the range of int values from 2 to n, mapping them to BigInteger and then reduction of the values with multiplication; Like

public static BigInteger factorial(int n) {
    if (n < 0) {
        return BigInteger.ZERO;
    }
    return IntStream.rangeClosed(2, n).mapToObj(BigInteger::valueOf) //
            .reduce(BigInteger.ONE, (a, b) -> a.multiply(b));
}