Hollow Concentric Circle Approximation
This program approximates concentric circles using stars.
Problem Statement
Write a Java program that prints concentric circles approximated in text with 9x9 grid.
Source Code
| 1 | public class HollowConcentricCircle { |
| 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("* "); |
| 8 | else System.out.print(" "); |
| 9 | } |
| 10 | System.out.println(); |
| 11 | } |
| 12 | } |
| 13 | } |
Program Output
* * *
* *
* *
* *
* *
* *
* *
* *
* * *
Explanation
The Manhattan distance from the grid center is computed for every cell, and stars are printed only at specific distance values, so multiple concentric ring-like layers of stars approximate circles in a text grid.