﻿ Java - Find the greatest of three numbers

# Java: Find the greatest of three numbers

## Java Conditional Statement: Exercise-3 with Solution

Write a Java program that takes three numbers from the user and prints the greatest number.

Test Data
Input the 1st number: 25
Input the 2nd number: 78
Input the 3rd number: 87

Pictorial Presentation: Sample Solution:

Java Code:

``````import java.util.Scanner;
public class Exercise3 {

public static void main(String[] args) {
Scanner in = new Scanner(System.in);

System.out.print("Input the 1st number: ");
int num1 = in.nextInt();

System.out.print("Input the 2nd number: ");
int num2 = in.nextInt();

System.out.print("Input the 3rd number: ");
int num3 = in.nextInt();

if (num1 > num2)
if (num1 > num3)
System.out.println("The greatest: " + num1);

if (num2 > num1)
if (num2 > num3)
System.out.println("The greatest: " + num2);

if (num3 > num1)
if (num3 > num2)
System.out.println("The greatest: " + num3);
}
}
```
```

Sample Output:

```Input the 1st number: 25
Input the 2nd number: 78
Input the 3rd number: 87
The greatest: 87
```

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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