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:

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:

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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