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Java Exercises: Accept a number and check the number is even or not

Java Basic: Exercise-49 with Solution

Write a Java program to accept a number and check the number is even or not. Prints 1 if the number is even or 0 if the number is odd.

Pictorial Presentation:

Java Basic Exercises: Accept a number and check the number is even or not

Sample Solution:

Java Code:

import java.util.*;
 public class Exercise49 {
     public static void main(String[] args){
	 Scanner in = new Scanner(System.in);
	 System.out.print("Input a number: ");
     int n = in.nextInt(); 
            if (n % 2 == 0) {
                System.out.println(1); 
               }
			else {
                System.out.println(0); 
              }
     }
}

Sample Output:

Input a number: 20                                                     
1

Flowchart:

Flowchart: Java exercises: Accept a number and check the number is even or not

Java Code Editor:

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Previous: Write a Java program to print the odd numbers from 1 to 99. Prints one number per line.
Next: Write a Java program to print numbers between 1 to 100 which are divisible by 3, 5 and by both.

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Java: Tips of the Day

Array vs ArrayLists:

The main difference between these two is that an Array is of fixed size so once you have created an Array you cannot change it but the ArrayList is not of fixed size. You can create instances of ArrayLists without specifying its size. So if you create such instances of an ArrayList without specifying its size Java will create an instance of an ArrayList of default size.

Once an ArrayList is full it re-sizes itself. In fact, an ArrayList is internally supported by an array. So when an ArrayList is resized it will slow down its performance a bit as the contents of the old Array must be copied to a new Array.

At the same time, it's compulsory to specify the size of an Array directly or indirectly while creating it. And also Arrays can store both primitives and objects while ArrayLists only can store objects.

Ref: https://bit.ly/3o8L2KH