[백준 Java] 2444: 별 찍기 - 7

1. 문제

2. 맞춘코드

/*
- 5:
    *
   ***
  *****
 *******
*********
 *******
  *****
   ***
    *
*/

import java.util.Scanner;

public class bj2444{
	public static void main(String[] args){
	
	Scanner sc = new Scanner(System.in);
	int num = sc.nextInt();
	
	for (int i=0; i<num ;i++ )			//삼각형 위	0	1	2	3	4
	{
		for (int j=num-1-i; j>0 ;j--)	//공백		4	3	2	1	0
		{
			System.out.print(" ");
		}
		for (int j=0; j<2*i+1 ;j++ )	//별			1	3	5	7	9		
		{
			System.out.print("*");
		}
		System.out.println();
	}

	for (int i=num-1; i>0 ;i-- )		//삼각형 아래	4	3	2	1
	{
		for (int j=0; j<num-i ;j++ )	//공백		0	1	2	3
		{
			System.out.print(" ");
		}
		for (int j=2*i-1; j>0 ;j-- )	//별			7	5	3	1
		{
			System.out.print("*");
		}
		System.out.println();
	}
	

	}
}