﻿ Java - Reads a floating-point number and print result

# Java: Reads a floating-point number and print result

## Java Conditional Statement: Exercise-28 with Solution

Write a Java program that reads a floating-point number. If the number is zero it prints "zero", otherwise, print "positive" or "negative". Add "small" if the absolute value of the number is less than 1, or "large" if it exceeds 1,000,000.

Test Data
Input a number: -2534

Pictorial Presentation:

Sample Solution:

Java Code:

``````import java.util.Scanner;
public class Exercise28 {

public static void main(String[] args)
{
Scanner in = new Scanner(System.in);
System.out.print("Input a number: ");
double n = in.nextDouble();

if (n > 0)
{
if (n < 1)
{
System.out.println("Positive small");
}
else if (n > 1000000)
{
System.out.println("Positive large");
}
else
{
System.out.println("Positive");
}
}
else if (n < 0)
{
if (Math.abs(n) < 1)
{
System.out.println("Negative small");
}
else if (Math.abs(n) > 1000000)
{
System.out.println("Negative large");
}
else
{
System.out.println("Negative");
}
}
else
{
System.out.println("Zero");
}
}
}
```
```

Sample Output:

```Input a number: -2534
Negative
```

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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