20220601 Mathematics: zero after factorial

        Title Description ： Given an integer  n , return  n!  The number of trailing zeros in the result . Tips  n! = n * (n - 1) * (n - 2) * ... * 3 * 2 * 1.

        coded ：

    public int trailingZeroes(int n) {
        int result = 0;
        while (n >= 5){
            result += n/5;
            n /= 5;
        }
        return result;
    }