﻿ Java - Print a pyramid pattern with repeating numbers

# Java: Print a pattern like a pyramid

## Java Conditional Statement: Exercise-19 with Solution

Write a Java program to make such a pattern like a pyramid with a number that repeats in the same row.

```       1
2 2
3 3 3
4 4 4 4
```

Test Data
Input number of rows : 4

Pictorial Presentation:

Sample Solution:

Java Code:

``````import java.util.Scanner;
public class Exercise19 {

public static void main(String[] args)
{
int i,j,n,s,x;
System.out.print ("Input number of rows : ");
Scanner in = new Scanner(System.in);
n = in.nextInt();

s=n+4-1;
for(i=1;i<=n;i++)
{
for(x=s;x!=0;x--)
{
System.out.print(" ");
}
for(j=1;j<=i;j++)
{
System.out.print(i+" ");
}
System.out.println();
s--;
}
}
}
```
```

Sample Output:

```Input number of rows : 4
1
2 2
3 3 3
4 4 4 4
```

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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