Java: Print the Floyd's Triangle

Java Conditional Statement: Exercise-20 with Solution

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:

Java conditional statement Exercises: Print the Floyd's Triangle

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 + " ");

Sample Output:

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


Flowchart: Java Conditional Statement Exercises - Print the Floyd's Triangle

Java Code Editor:

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Previous: Write a program in Java to print such pattern like a pyramid with a number which will repeat the number in the same row.
Next: Write a program in Java to display the pattern like a diamond.

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Java: Tips of the Day


Checks if a value is positive power of two.

To understand how it works let's assume we made a call IsPowerOfTwo(4).

As value is greater than 0, so right side of the && operator will be evaluated.

The result of (~value + 1) is equal to value itself. ~100 + 001 => 011 + 001 => 100. This is equal to value.

The result of (value & value) is value. 100 & 100 => 100.

This will value the expression to true as value is equal to value.

public static boolean isPowerOfTwo(final int value) {
    return value > 0 && ((value & (~value + 1)) == value);

Ref: https://bit.ly/3sA5d4I


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