JAVA 구구단 출력

package kr.ac.jnu.day06;

public class GugudanMain {

	public static void main(String[] args) {
		
		for(int dan = 2; dan <= 9; dan += 3) {
			for(int i = 0; i <= 9; i++) {
				for(int j = dan; j <= 9 && j < dan + 3; j++) {
					if(i == 0)
						System.out.printf("*** %d단 ***\t", j);
					else
						System.out.printf("%d * %d = %d\t", j, i, j * i);
				}
				System.out.println();
			}
			System.out.println();
		}
		
//		for(int dan = 2; dan <= 9; dan += 3) {
//			for(int i = 1; i <= 9; i++) {
//				System.out.printf("%d * %d = %d\t", dan, i, dan * i);
//				System.out.printf("%d * %d = %d\t", dan+1, i, (dan+1) * i);
//				if((dan+2) <= 9)
//				System.out.printf("%d * %d = %d\t", dan+2, i, (dan+2) * i);
//				System.out.println();
//			}
//			System.out.println();
//		}
	}
}