Java Program to Print a Right Triangle Alphabet Pattern

Learn a Java Program to Print a Right Triangle Alphabet Pattern from A to Z. This pattern is created using nested for loops and character typecasting.

Code Explanation (Step-by-Step)

  • Create a Scanner class object to accept user input.
  • Initialize an integer variable c = 65, which stores the ASCII value of ‘A’.
  • The outer for loop controls the number of rows.
  • The inner for loop prints the alphabet characters in each row.
  • The expression (char)(c + j) converts ASCII values into their corresponding alphabet characters.
  • Each row prints one additional alphabet compared to the previous row, forming a right triangle pattern.
				
					import java.util.Scanner;

public class AlphabetPattern {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        System.out.println("Enter the number of rows:");
        int n = sc.nextInt();

        int c = 65;

        System.out.println("Right Alphabetic Triangle Pattern :-");

        for (int i = 1; i <= n; i++) {

            for (int j = 0; j < i; j++) {
                System.out.print((char) (c + j));
            }

            System.out.println();
        }

        sc.close();
    }
}
Enter the number of rows:
5
 
Right Alphabetic Triangle Pattern :-
A
AB
ABC
ABCD
ABCDE

Java 8 Program to Print Alphabets A to Z in Right Triangle Pattern

				
					import java.util.Scanner;
import java.util.stream.IntStream;

public class AlphabetPattern {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

        System.out.println("Enter the number of rows:");
        int n = sc.nextInt();

        System.out.println("Right Alphabetic Triangle Pattern :-");

        IntStream.rangeClosed(1, n)
                .forEach(i -> {
                    IntStream.rangeClosed(0, i - 1)
                            .forEach(j -> System.out.print((char) ('A' + j)));
                    System.out.println();
                });

        sc.close();
    }
}

What is a Right Alphabetic Triangle Pattern?

A Right Alphabetic Triangle Pattern is a pattern in which alphabet characters are displayed in the shape of a right-angled triangle. Each row contains one more character than the previous row.
Example:
A
AB
ABC
ABCD
ABCDE
In this pattern:
• The first row contains A.
• The second row contains AB.
• The third row contains ABC.
• Each new row adds the next alphabet character, forming a right triangle.

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