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

Scanner scanner = new Scanner(System.in);        int num = scanner.nextInt();        double sum = 0;        if (num%2!=0) {            for (int i = 1; i <= num; i=i+2) {                sum += 1.0/i;                System.out.print(1+"/"+i+"\t");                System.out.print(1.0/i+"\t");                System.out.println("");            }        }else {            for (int i = 2; i <= num; i=i+2) {                sum += 1.0/i;                System.out.print(1+"/"+i+"\t");                System.out.print(1.0/i+"\t");                System.out.println("");            }        }        System.out.println(sum);