For문 실습 3_ 구 구단

package ch04.sec04;

public class MultiplicationTableExample {

	public static void main(String[] args) {
		for(int j=2;j<10;j++){
			System.out.printf("%d 단\n",j);
			for(int i=1;i<10;i++) {
				System.out.printf("%d x %d = %d \n",j,i,(j*i));
			}
			System.out.printf("\n");
		}
	}
}

 

package ch04.sec04;

public class MultiplicationTableExample2 {

	public static void main(String[] args) {
		for(int i=1;i<10;i++){
			for(int j=2;j<6;j++) {
				System.out.printf("%d x %d = %d\t",j,i,(j*i));
			}
			System.out.println(" ");
		}
		System.out.printf("\n");
		System.out.printf("----------------------------------------------------------------");
		System.out.printf("\n");
		System.out.printf("\n");

		for(int i=1;i<10;i++){
			for(int j=6;j<10;j++) {
				System.out.printf("%d x %d = %d\t",j,i,(j*i));
			}
			System.out.println(" ");
		}
	}
}

 

선생님 답안

package ch04.sec04;

public class MultiplicationTableExample2 {

	public static void main(String[] args) {
		int k=2;
		for(int i=1;i<=18;i++){
			for(int j=k;j<=(k+3);j++) {
				if(i<10) {
					System.out.printf("%d x %d = %d\t",j,i,(j*i));
				}else {
					System.out.printf("%d x %d = %d\t",j,(i-9),(j*(i-9)));
				}
			}
			System.out.println();
			if(i==9) {
				k=6;
				System.out.println();
			}
		}
		System.out.println();
	}
}