Java: Generate a following @'s triangle

Java Conditional Statement: Exercise-24 with Solution

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

Test Data
Input the number: 6

Pictorial Presentation:

Java conditional statement Exercises: Generate a following @'s triangle

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++) 


Sample Output:

Input the number: 6                                                                                           


Flowchart: Java Conditional Statement Exercises - Generate a following @'s triangle

Java Code Editor:

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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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