Hollow Concentric Octagon with Numbers
This program prints a hollow concentric octagon using numbers.
Problem Statement
Write a Java program that prints concentric hollow octagons with numbers up to 7 rows.
Source Code
| 1 | public class HollowConcentricOctagonNumbers { |
| 2 | public static void main(String[] args) { |
| 3 | int n=7; |
| 4 | for(int i=0;i<n;i++){ |
| 5 | for(int j=0;j<n;j++){ |
| 6 | if(i==0||i==n-1||j==0||j==n-1||i==j||i+j==n-1) |
| 7 | System.out.print(i+1+" "); |
| 8 | else System.out.print(" "); |
| 9 | } |
| 10 | System.out.println(); |
| 11 | } |
| 12 | } |
| 13 | } |
Program Output
1 1 1 1 1 1 1 2 2 2 2 3 3 3 3 4 4 4 5 5 5 5 6 6 6 6 7 7 7 7 7 7 7
Explanation
The same border-and-diagonal octagon condition is used, but each marked cell prints the current row index instead of a star, so the octagon outline is labeled with numbers by row.