当输入无效数字时,其他循环不起作用

Question

System.out.println("Enter number of dice to throw, an integer [2, 10]:  ");
Scanner keyboard = new Scanner (System.in); 
n = keyboard.nextInt();

//if the input is valid
if (n>1 && n<11)
{`
    System.out.println("good");
    Random rn = new Random(); 
    int random = rn.nextInt((6-1) +1) +1; 
    System.out.println("random number is " + random); 
}     
else 
{
    //if the users input is invalid
    while (n<2 && n>10)
    {
        System.out.println("error, must be in [2,10]  ");
        n = keyboard.nextInt(); 
    }
}

Answer 1

你的逻辑不正确.这个数字n不能少于2 和大于10以往.你希望小于2 或大于10.用||而不是&&.

while (n<2 || n>10)