循环猜数
Random r=new Random();
int number=r.nextInt(100)+1;
while(true){
Scanner sc=new Scanner(System.in);
System.out.println("请输入你猜的数字:");
int guessNumber=sc.nextInt();
//比较大小
if(guessNumber<number){
System.out.println("你猜小了。");
}else if(guessNumber>number){
System.out.println("你猜大了。");
}else{
System.out.println("恭喜你,猜对了!");
break;
}