Java if语句

import java.util.Scanner;
public class nn {
    public static void main(String[] args) {
        //输入数据
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入一个数字");
        int score = sc.nextInt();
        if (score >= 60 && score <= 80) {
            System.out.println("恭喜");
        } else if (score >= 30 && score <= 59) {99
            System.out.println("你好");
        } else if (score >= 10 && score <= 29) {
            System.out.println("l");
        } else {
            System.out.println("11");
        }
    }
}