Hollow Concentric Octagon Hybrid (Stars + Alphabets)
This program prints hollow concentric octagons alternating stars and alphabets.
Problem Statement
Write a Java program that prints concentric hollow octagons where odd rows have stars and even rows have alphabets.
Source Code
| 1 | public class HollowConcentricOctagonHybrid { |
| 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 | if(i%2==0) System.out.print("* "); |
| 8 | else System.out.print((char)('A'+i)+" "); |
| 9 | } else System.out.print(" "); |
| 10 | } |
| 11 | System.out.println(); |
| 12 | } |
| 13 | } |
| 14 | } |
Program Output
* * * * * * * A A A A * * * * D D D * * * * F F F F * * * * * * *
Explanation
The same border-and-diagonal octagon condition applies, but the row-parity check i%2==0 decides whether a marked cell prints a star or an alphabet, mixing two symbol types across the octagon outline.