﻿ Java - Generate random integers in a specific range

# Java: Generate random integers in a specific range

## Java Numbers: Exercise-3 with Solution

Write a Java program to generate random integers in a specific range.

Pictorial Presentation: Sample Solution:

Java Code:

``````import java.util.Scanner;
public class Example3  {

public static void main( String args[] ){
Scanner sc = new Scanner( System.in );
System.out.print("Input the starting number of the range: ");
int rsnum = sc.nextInt();
System.out.print("Input the ending number of the range: ");
int renum = sc.nextInt();
int random_num = rsnum + (int)(Math.random() * ((renum - rsnum) + 1));
System.out.println(random_num);
}
}
```
```

Sample Output:

```Input the starting number of the range: 5
Input the ending number of the range: 25
10
```

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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