Numeric Spiral Diamond
This program prints a diamond filled with sequential numbers in spiral-like growth.
Problem Statement
Write a Java program that prints a diamond pattern filled with sequential numbers up to 5 rows.
Source Code
| 1 | public class NumericSpiralDiamond { |
| 2 | public static void main(String[] args) { |
| 3 | int n = 5, num=1; |
| 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++) System.out.print(num++ + " "); |
| 7 | System.out.println(); |
| 8 | } |
| 9 | for(int i=n-1; i>=1; i--) { |
| 10 | for(int j=i; j<n; j++) System.out.print(" "); |
| 11 | for(int j=1; j<=2*i-1; j++) System.out.print(num++ + " "); |
| 12 | System.out.println(); |
| 13 | } |
| 14 | } |
| 15 | } |
Program Output
1
2 3 4
5 6 7 8 9
10 11 12 13 14 15 16
17 18 19 20 21 22 23 24 25
26 27 28 29 30 31 32
33 34 35 36 37
38 39 40
41
Explanation
The variable num continuously increments and is printed instead of a fixed symbol as the diamond shape is built through increasing then decreasing rows, so the diamond becomes filled with a continuous sequence of numbers.