Sequential Number Diamond
This program prints a diamond of sequential numbers using nested for loop.
Problem Statement
Write a Java program that prints a diamond of sequential numbers up to 5 rows.
Source Code
| 1 | public class NumberDiamond { |
| 2 | public static void main(String[] args) { |
| 3 | int num = 1; |
| 4 | for(int i=1; i<=5; i++) { |
| 5 | for(int j=1; j<=i; j++) { |
| 6 | System.out.print(num + " "); |
| 7 | num++; |
| 8 | } |
| 9 | System.out.println(); |
| 10 | } |
| 11 | for(int i=4; i>=1; i--) { |
| 12 | for(int j=1; j<=i; j++) { |
| 13 | System.out.print(num + " "); |
| 14 | num++; |
| 15 | } |
| 16 | System.out.println(); |
| 17 | } |
| 18 | } |
| 19 | } |
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
Explanation
The first half builds increasing rows, second half decreases rows, forming a diamond. Numbers increment sequentially. Shows how nested loops can generate numeric diamonds.