Java Program to Print Triangle of Alphabets in Reverse Pattern

Write a Java program to print triangle of alphabets in reverse pattern using for loop.

package Alphabets;
import java.util.Scanner;

public class TriangleAlpReverse1 {
	
	private static Scanner sc;
	
	public static void main(String[] args) {
		
		sc = new Scanner(System.in);	
		
		System.out.print("Enter Triangle of Alphabets in Reverse Rows = ");
		int rows = sc.nextInt();
		
		System.out.println("Printing Triangle of Alphabets in Reverse Order");
		
		int alphabet = 65;
		
		for (int i = rows - 1; i >= 0; i--) 
		{
			for (int j = 0; j < i; j++ ) 	
			{
				System.out.print(" ");
			}
			for(int k = i; k <= rows - 1; k++)
			{
				System.out.print((char)(alphabet + k) + " ");
			}
			System.out.println();
		}
	}
}

Java program to print triangle pattern of alphabets in reverse order using a while loop.

package Alphabets;

import java.util.Scanner;

public class TriangleAlpReverse2 {
	
	private static Scanner sc;
	
	public static void main(String[] args) {
		
		sc = new Scanner(System.in);	
		
		System.out.print("Enter Triangle of Alphabets in Reverse Rows = ");
		int rows = sc.nextInt();
		
		System.out.println("Printing Triangle of Alphabets in Reverse Order");
		
		int i, j, k, alphabet = 65;
		
		i = rows - 1;
		while(i >= 0) 
		{
			
			j = 0;
			while( j < i ) 	
			{
				System.out.print(" ");
				j++;
			}
			
			k = i;
			while(k <= rows - 1)
			{
				System.out.print((char)(alphabet + k) + " ");
				k++;
			}
			
			System.out.println();
			i--;
		}
	}
}

Enter Triangle of Alphabets in Reverse Rows = 13
Printing Triangle of Alphabets in Reverse Order
            M 
           L M 
          K L M 
         J K L M 
        I J K L M 
       H I J K L M 
      G H I J K L M 
     F G H I J K L M 
    E F G H I J K L M 
   D E F G H I J K L M 
  C D E F G H I J K L M 
 B C D E F G H I J K L M 
A B C D E F G H I J K L M 

This Java pattern example prints the triangle of alphabets in descending order or reverse order using the do while loop.

package Alphabets;

import java.util.Scanner;

public class TriangleAlpReverse3 {
	
	private static Scanner sc;
	
	public static void main(String[] args) {
		
		sc = new Scanner(System.in);	
		
		System.out.print("Enter Triangle of Alphabets in Reverse Rows = ");
		int rows = sc.nextInt();
		
		System.out.println("Printing Triangle of Alphabets in Reverse Order");
		
		int i, j, k, alphabet = 65;
		
		i = rows - 1;
		do 
		{
			
			j = 0;
			do	
			{
				System.out.print(" ");
				
			} while( j++ < i ) ;
			
			k = i;
			do
			{
				System.out.print((char)(alphabet + k) + " ");

			} while(++k <= rows - 1);
			
			System.out.println();

		} while(--i >= 0);
	}
}

Enter Triangle of Alphabets in Reverse Rows = 16
Printing Triangle of Alphabets in Reverse Order
                P 
               O P 
              N O P 
             M N O P 
            L M N O P 
           K L M N O P 
          J K L M N O P 
         I J K L M N O P 
        H I J K L M N O P 
       G H I J K L M N O P 
      F G H I J K L M N O P 
     E F G H I J K L M N O P 
    D E F G H I J K L M N O P 
   C D E F G H I J K L M N O P 
  B C D E F G H I J K L M N O P 
 A B C D E F G H I J K L M N O P