Java: Generate a following @'s triangle

Last update on April 10 2025 05:38:20 (UTC/GMT +8 hours)

Right-Angle Triangle with @ Symbols

Write a Java program to generate the following @'s triangle.

Test Data
Input the number: 6

Pictorial Presentation:

Sample Solution:

Java Code:

import java.util.Scanner;
public class Exercise24 {
   public static void main(String args[]) 
    {
        Scanner in = new Scanner(System.in);
        System.out.print("Input the number: ");
        int n = in.nextInt();

        for (int i = 0; i < n; i++) 
        {
            for (int spc = n - i; spc > 0; spc--) 
            {
                System.out.print(" ");
            }
            for (int j = 0; j <= i; j++) 
            {
                System.out.print("@");
            }
            System.out.println();
        }
    }

}

Sample Output:

Input the number: 6                                                                                           
      @                                                                                                       
     @@                                                                                                       
    @@@                                                                                                       
   @@@@                                                                                                       
  @@@@@                                                                                                       
 @@@@@@

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Java program to generate a right-angle triangle with a user-defined symbol in place of '@'.
• Write a Java program to print a right-angle triangle with '@' symbols using recursion instead of loops.
• Write a Java program to create a right-angle triangle pattern with '@' symbols where each row contains twice as many symbols as the previous row.
• Write a Java program to generate and then invert a right-angle triangle pattern made of '@' symbols.

Java Code Editor:

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