Spiral Triangle Hybrid (Numbers + Alphabets)
This program prints a triangular spiral alternating numbers and alphabets.
Problem Statement
Write a Java program that prints a triangle of 6 rows where spiral order alternates numbers and alphabets.
Source Code
| 1 | public class SpiralTriangleHybrid { |
| 2 | public static void main(String[] args) { |
| 3 | int n=6, num=1; |
| 4 | char ch='A'; boolean number=true; |
| 5 | for(int i=0;i<n;i++){ |
| 6 | for(int j=0;j<=i;j++){ |
| 7 | if(number) System.out.print(num+++" "); |
| 8 | else { |
| 9 | System.out.print(ch+" "); |
| 10 | ch++; |
| 11 | if(ch>'Z') ch='A'; |
| 12 | } |
| 13 | number=!number; |
| 14 | } |
| 15 | System.out.println(); |
| 16 | } |
| 17 | } |
| 18 | } |
Program Output
1 A 2 B 3 C 4 D 5 E F 6 G 7 H I 8 J 9 K 10
Explanation
A boolean toggle alternates between printing a number and an alphabet for each successive cell across the whole triangle, so adjacent positions consistently alternate between the two symbol types.