﻿ Java - Display Pascal's triangle

# Java: Display Pascal's triangle

## Java Conditional Statement: Exercise-22 with Solution

Write a Java program to display Pascal's triangle.

Construction of Pascal's Triangle:

As shown in Pascal's triangle, each element is equal to the sum of the two numbers immediately above it. Test Data
Input number of rows: 5

Sample Solution:

Java Code:

``````import java.util.Scanner;
public class Exercise22 {

public static void main(String[] args)
{
int no_row,c=1,blk,i,j;
System.out.print("Input number of rows: ");
Scanner in = new Scanner(System.in);
no_row = in.nextInt();
for(i=0;i<no_row;i++)
{
for(blk=1;blk<=no_row-i;blk++)
System.out.print(" ");
for(j=0;j<=i;j++)
{
if (j==0||i==0)
c=1;
else
c=c*(i-j+1)/j;
System.out.print(" "+c);
}
System.out.print("\n");
}
}
}
```
```

Sample Output:

```Input number of rows: 5
1
1 1
1 2 1
1 3 3 1
1 4 6 4 1
```

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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