﻿ Java - Generate a following *'s triangle

Java: Generate a following *'s triangle

Java Conditional Statement: Exercise-23 with Solution

Write a Java program to generate the following * triangles.

Test Data
Input number of rows: 6

Pictorial Presentation:

Sample Solution:

Java Code:

``````import java.util.Scanner;
public class Exercise23 {
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 = n; i > 0; i--)
{
for (int spc = n - i; spc > 0; spc--)
{
System.out.print(" ");
}
for (int j = 0; j < i; j++)
{
System.out.print("*");
}
System.out.println();
}
}

}
```
```

Sample Output:

```Input the number: 6
******
*****
****
***
**
*
```

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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