Hollow Concentric Diamond Hybrid (Stars + Alphabets)
This program prints hollow concentric diamonds alternating stars and alphabets.
Problem Statement
Write a Java program that prints concentric hollow diamonds where odd rows have stars and even rows have alphabets.
Source Code
| 1 | public class HollowConcentricDiamondHybrid { |
| 2 | public static void main(String[] args) { |
| 3 | int n = 6; |
| 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) { |
| 8 | if(i%2==1) System.out.print("*"); |
| 9 | else System.out.print((char)('A'+i-1)); |
| 10 | } else System.out.print(" "); |
| 11 | } |
| 12 | System.out.println(); |
| 13 | } |
| 14 | for(int i=n-1; i>=1; i--) { |
| 15 | for(int j=i; j<n; j++) System.out.print(" "); |
| 16 | for(int j=1; j<=2*i-1; j++) { |
| 17 | if(j==1 || j==2*i-1) { |
| 18 | if(i%2==1) System.out.print("*"); |
| 19 | else System.out.print((char)('A'+i-1)); |
| 20 | } else System.out.print(" "); |
| 21 | } |
| 22 | System.out.println(); |
| 23 | } |
| 24 | } |
| 25 | } |
Program Output
*
B B
* *
D D
* *
F F
* *
D D
* *
B B
*
Explanation
The hollow diamond boundary logic from both halves is combined with a row-parity check, so odd rows print stars at boundaries while even rows print an alphabet derived from the row index, forming a hollow diamond hybrid.