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Java Program to Display Floyd’s Triangle

  • Difficulty Level : Medium
  • Last Updated : 28 Jul, 2021

Floyd’s triangle is a triangle with first natural numbers. It is the right arrangement of the numbers/values or patterns. Basically, it is a left to right arrangement of natural numbers in a right-angled triangle

Illustration: Suppose if no of rows to be displayed is 5 then the desired output should display 5 rows as:

1
2 3
4 5 6
7 8 9 10
11 12 13 14 15

Algorithm:

  1. Initialization of variables
    • Create variables in memory holding rows and columns.
    • Create and initialize variable holding patterns or values to be displayed.
  2. Traversing over rows and columns using nested for loops.
    • Outer loop for rows.
    • Inner loop for columns in the current row.
  3. Dealing with variable holding dynamic values as per execution as initialized outside nested loops.
    • If values are to be displayed, increment this variable inside the loop for rows and outside loop for columns.
    • If patterns are to be displayed, assign the character outside loop while creation and no alternation of holder value in any of loops.

Implementation: Floyd’s Triangle

Example 

Java




// Java program to display Floyd's triangle
 
// Importing Java libraries
import java.util.*;
 
// Main class
class GFG {
 
    // Main driver method
    public static void main(String[] args)
    {
        // No of rows to be printed
        int n = 5;
 
        // Creating and initializing variable for
        // rows, columns and display value
        int i, j, k = 1;
 
        // Nested iterating for 2D matrix
        // Outer loop for rows
        for (i = 1; i <= n; i++) {
 
            // Inner loop for columns
            for (j = 1; j <= i; j++) {
 
                // Printing value to be displayed
                System.out.print(k + "  ");
 
                // Incremeting value displayed
                k++;
            }
 
            // Print elements of next row
            System.out.println();
        }
    }
}
Output
1  
2  3  
4  5  6  
7  8  9  10  
11  12  13  14  15


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