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Java: Print a pattern like right angle triangle

Java Conditional Statement: Exercise-17 with Solution

Write a program in Java to make such a pattern like a right angle triangle with a number which repeats a number in a row.
The pattern is as follows :

1
22
333
4444

Test Data
Input number of n : 4

Pictorial Presentation:

Java conditional statement Exercises: Print a pattern like right angle triangle

Sample Solution:

Java Code:

import java.util.Scanner;
public class Exercise17 {

  public static void main(String[] args)

			{
   	          int i,j,n;

               System.out.print("Input number of n : ");
            	Scanner in = new Scanner(System.in);
		    n = in.nextInt();
  
               for(i=1;i<=n;i++)
               {
	           for(j=1;j<=i;j++)
	            System.out.print(i);
	          System.out.println("");
              }
            }
            } 
			 

Sample Output:

Input number of n : 4                                                                                         
1                                                                                                       
22                                                                                                       
333                                                                                                       
4444

Flowchart:

Flowchart: Java Conditional Statement Exercises - Print a pattern like right angle triangle

Java Code Editor:

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Java: Tips of the Day

IsPowerOfTwo

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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