Hollow Concentric Octagon with Hybrid Symbols
This program prints hollow concentric octagons alternating stars, numbers, and alphabets.
Problem Statement
Write a Java program that prints concentric hollow octagons where boundaries alternate stars, numbers, and alphabets cyclically.
Source Code
| 1 | public class HollowConcentricOctagonHybridSymbols { |
| 2 | public static void main(String[] args) { |
| 3 | int n=7,num=1; char ch='A'; int cycle=0; |
| 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(cycle%3==0) System.out.print("* "); |
| 8 | else if(cycle%3==1) System.out.print(num+++" "); |
| 9 | else { |
| 10 | System.out.print(ch+" "); |
| 11 | ch++; |
| 12 | if(ch>'Z') ch='A'; |
| 13 | } |
| 14 | cycle++; |
| 15 | } else System.out.print(" "); |
| 16 | } |
| 17 | System.out.println(); |
| 18 | } |
| 19 | } |
| 20 | } |
Program Output
* 1 A * 2 B * C * 3 D * 4 E F G H I * J * K L M N O * P * Q * R * S T U V W X
Explanation
A running cycle counter increments only at boundary/diagonal cells and its value modulo 3 decides whether a star, number, or alphabet is printed, so the octagon boundary itself cycles through three different symbol types in sequence.