Spiral Rectangle Hybrid (Stars + Numbers)
This program prints a rectangular spiral alternating stars and numbers.
Problem Statement
Write a Java program that prints a 4x6 rectangle where spiral order alternates stars and numbers.
Source Code
| 1 | public class SpiralRectangleHybrid { |
| 2 | public static void main(String[] args) { |
| 3 | int rows=4, cols=6, num=1; |
| 4 | String[][] arr=new String[rows][cols]; |
| 5 | int top=0, left=0, bottom=rows-1, right=cols-1; |
| 6 | boolean star=true; |
| 7 | while(top<=bottom && left<=right) { |
| 8 | for(int i=left; i<=right; i++) arr[top][i]=star?"*":String.valueOf(num++); |
| 9 | star=!star; top++; |
| 10 | for(int i=top; i<=bottom; i++) arr[i][right]=star?"*":String.valueOf(num++); |
| 11 | star=!star; right--; |
| 12 | for(int i=right; i>=left; i--) arr[bottom][i]=star?"*":String.valueOf(num++); |
| 13 | star=!star; bottom--; |
| 14 | for(int i=bottom; i>=top; i--) arr[i][left]=star?"*":String.valueOf(num++); |
| 15 | star=!star; left++; |
| 16 | } |
| 17 | for(int i=0; i<rows; i++) { |
| 18 | for(int j=0; j<cols; j++) System.out.print(arr[i][j] + "\t"); |
| 19 | System.out.println(); |
| 20 | } |
| 21 | } |
| 22 | } |
Program Output
* 2 * 4 * 6 * 14 * 16 * 8 * 20 * 18 * 10 * * * * * *
Explanation
A boolean toggle alternates between star and number fills for each boundary loop of the rectangular spiral, so this rectangular matrix mirrors the earlier hybrid pyramid logic on a non-square shape.