1.5

public static void main(String[] args){
           Scanner input = new Scanner(System.in);
           Random rand = new Random();
           int n=0,r=1,d=0;
           do{
           System.out.println("nhap so 10-99");
           n = input.nextInt();
           } while (n<10||n>99);
           do{
              r = rand.nextInt(90)+10;
              d++;
              System.out.println(" so ngau nhien dc tao ra la " + r);

           } while (r!=n);
           System.out.println(" da tao duoc so ngau nhien dung bang so da nhap sau "+d+" lan");
     }