Numeric Hourglass Pattern
This program prints an hourglass pattern with numbers.
Problem Statement
Write a Java program that prints an hourglass pattern with numbers up to 5 rows.
Source Code
| 1 | public class NumericHourglass { |
| 2 | public static void main(String[] args) { |
| 3 | int n = 5; |
| 4 | for(int i=n; i>=1; i--) { |
| 5 | for(int j=n; j>i; j--) System.out.print(" "); |
| 6 | for(int j=1; j<=2*i-1; j++) System.out.print(i); |
| 7 | System.out.println(); |
| 8 | } |
| 9 | for(int i=2; i<=n; i++) { |
| 10 | for(int j=n; j>i; j--) System.out.print(" "); |
| 11 | for(int j=1; j<=2*i-1; j++) System.out.print(i); |
| 12 | System.out.println(); |
| 13 | } |
| 14 | } |
| 15 | } |
Program Output
555555555
4444444
33333
222
1
222
33333
4444444
555555555
Explanation
Similar to the star hourglass, the first loop builds an inverted numeric pyramid and the second builds an upright numeric pyramid, but each row repeats its own row index instead of stars, forming a numeric hourglass shape.