Test2.java 题目：编写一个函数，输入n为偶数时，调用函数求1/2+1/4+...+1/n,当输入n为奇数时，调用函数1/1+1/3+...+1/n(利用指针函数)

public class Test2 {
    public static void main(String[] args) {
        int n = 6;
        double sum = 0;
        if (n % 2 == 0) {
            sum = evenSum(n);
        } else {
            sum = oddSum(n);
        }
        System.out.println(sum);
    }

    public static double evenSum(int n) {
        double sum = 0;
        for (int i = 2; i <= n; i += 2) {
            sum += 1.0 / i;
        }
        return sum;
    }

    public static double oddSum(int n) {
        double sum = 0;
        for (int i = 1; i <= n; i += 2) {
            sum += 1.0 / i;
        }
        return sum;
    }
}

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