[5단계]함수 사용하기-2448번 별찍기

import java.util.*;
 
public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        star(n);
    }
    private static void star(int line){
        int n=line;
        int height = 3;
        int i,j,z;
        int k = (int)(Math.log(n/3)/Math.log(2)+1);
        String[] arr = new String[n];
        
        arr[0]="  *  ";
        arr[1]=" * * ";
        arr[2]="*****";
        
        for(i=1;i<k;i++){
            for(j=0;j<height;j++){
                arr[height+j]=arr[j]+" "+arr[j];
                for(z=0;z<height/3;z++)
                    arr[j]="   "+arr[j]+"   ";
                
            }
            height=2*height;
        }
        for(i=0;i<height;i++){
            System.out.println(arr[i]);
        }
    }
}