import java.util.*;
class gugu
{
    public static void main(String[] args)
    {
        Scanner sc=new Scanner(System.in);
        int dan;
        do{
            System.out.printf("단을 입력하시오..");
            dan = sc.nextInt();
            if(dan==0)break;
            if(2>dan || dan>9)continue;
            for(int i=1;i<10;i++){
                System.out.printf("%d X %d = %dn",dan,i,dan*i);
            }
        }while(true);
    }
}

------------------------------------------------------------------------------------
import java.util.*;
class gugu
{
    public static void main(String[] args)
    {
        Scanner sc=new Scanner(System.in);
        int dan;
        do{
            System.out.printf("단을 입력하시오..");
            dan = sc.nextInt();
            if(dan==0)break;
            if(2>dan || dan>9)continue;
            printGugu(dan);
        }while(true);
    }
    static void printGugu(int dan){
        for(int i=1;i<10;i++){
                System.out.printf("%d X %d = %dn",dan,i,dan*i);
            }
    }
}