Hollow Concentric Pentagon of Stars
This program prints a hollow concentric pentagon using stars.
Problem Statement
Write a Java program that prints concentric hollow pentagons with 5 rows.
Source Code
| 1 | public class HollowConcentricPentagonStars { |
| 2 | public static void main(String[] args) { |
| 3 | int n=5; |
| 4 | for(int i=1; i<=n; i++) { |
| 5 | for(int j=i; j<n; j++) System.out.print(" "); |
| 6 | for(int j=1; j<=2*i+1; j++) { |
| 7 | if(j==1 || j==2*i+1 || i==n) System.out.print("*"); |
| 8 | else System.out.print(" "); |
| 9 | } |
| 10 | System.out.println(); |
| 11 | } |
| 12 | } |
| 13 | } |
Program Output
* * * * * * * *********
Explanation
The inner loop width is 2*i+1 rather than 2*i-1, widening the shape slightly, and stars are printed only at boundaries or the full base, approximating a pentagon-like hollow outline.