Random r=new Random();
        int i=r.nextInt(100)+1;
        Scanner sc=new Scanner(System.in);
        while (true) {
            System.out.println("输入一个数：");
            int a=sc.nextInt();
            if(a<i){
                System.out.println("猜测过小");
            }
            else if (a>i){
                System.out.println("猜测过大");
            }
            else{
                System.out.println("恭喜猜中");
                break;
            }
        }