Java: Print the Floyd's Triangle

Last update on April 10 2025 05:38:18 (UTC/GMT +8 hours)

Print Floyd's Triangle

Write a Java program to print Floyd's Triangle.

Floyd's triangle is a right-angled triangular array of natural numbers, used in computer science education. It is named after Robert Floyd. It is defined by filling the rows of the triangle with consecutive numbers, starting with a 1 in the top left corner:

Test Data
Input number of rows : 5

Pictorial Presentation:

Sample Solution:

Java Code:

import java.util.Scanner;
public class Main {
public static void main(String[] args)
 {
   int numberOfRows;
   System.out.print("Input number of rows : ");
   Scanner in = new Scanner(System.in);
		    numberOfRows = in.nextInt();
   int number = 1;
   for (int row = 1; row <= numberOfRows; row++)
    {
   for (int column = 1; column <= row; column++)
     {
       System.out.print(number + " ");
       number++;
     }
     System.out.println();
    }
  }
}

Sample Output:

Input number of rows :  5
1 
2 3 
4 5 6 
7 8 9 10 
11 12 13 14 15 

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Java program to print Floyd’s Triangle in descending order.
• Write a Java program to generate Floyd’s Triangle recursively without using iterative loops.
• Write a Java program to print Floyd’s Triangle and calculate the sum of its elements row by row.
• Write a Java program to print Floyd’s Triangle with each row’s numbers in reverse order.

Java Code Editor:

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