递归：阶乘、斐波那契数列

• 阶乘

    public static void main(String[] args) {
        System.out.println(factorial(5));;
    }
    //factorial 阶乘
    public static long factorial(int n) {
        if (n == 1) {
            return 1;
        }
        return n*factorial(n-1);
    }

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