Hollow Concentric Circle with Numbers
This program approximates concentric circles using numbers.
Problem Statement
Write a Java program that prints concentric circles approximated in text with numbers in a 9x9 grid.
Source Code
| 1 | public class HollowConcentricCircleNumbers { |
| 2 | public static void main(String[] args) { |
| 3 | int n = 9; |
| 4 | for(int i=0; i<n; i++) { |
| 5 | for(int j=0; j<n; j++) { |
| 6 | int dist = Math.abs(i-n/2)+Math.abs(j-n/2); |
| 7 | if(dist==4 || dist==2 || dist==0) System.out.print(i+1 + " "); |
| 8 | else System.out.print(" "); |
| 9 | } |
| 10 | System.out.println(); |
| 11 | } |
| 12 | } |
| 13 | } |
Program Output
1 1 1
2 2
3 3
4 4
5 5
6 6
7 7
8 8
9 9 9
Explanation
The same Manhattan-distance ring logic is used, but instead of a fixed star, the current row index (i+1) is printed at the specified distances, so numeric rings approximate the concentric circles.