Java: Accepts an integer (n) and computes the value of n+nn+nnn

Java Basic: Exercise-44 with Solution

Write a Java program that accepts an integer (n) and computes the value of n+nn+nnn.

Sample Solution:

Java Code:

import java.util.Scanner;
public class Exercise44 {
 public static void main(String[] args) {

  int n;
  char s1, s2, s3;
  Scanner in = new Scanner(System.in);
  System.out.print("Input number: ");
  n = in .nextInt();
  System.out.printf("%d + %d%d  + %d%d%d\n", n, n, n, n, n, n);

Sample Output:

Input number: 5                                                        
5 + 55  + 555


Flowchart: Java exercises: Accepts an integer (n) and computes the value of n+nn+nnn

Java Code Editor:

Contribute your code and comments through Disqus.

Previous: Write a Java program to print the following string in a specific format.
Next: Write a Java program to find the size of a specified file.

What is the difficulty level of this exercise?

Test your Programming skills with w3resource's quiz.

Follow us on Facebook and Twitter for latest update.

Java: Tips of the Day

Handling Null Pointer Exception

Null pointer exception is a runtime exception that is thrown when an application is trying to use an object reference with a null value.

String fruit;

Here a null reference variable is passed as an argument of a method.


In the above code snippet, null is directly passed to a function. In both these instances, there is a high possibility of throwing the NullPointerException.

This exception can be fixed by using the if-else condition.

public class NullPointerExceptionExample{
    public static void main(String args[]){
        String fruit = "apple";
}//Using an if-else condition
    static void positionLocator(String fruit){
        if(fruit != null){
           System.out.println("Second character: "+fruit.charAt(0));
        else {
           System.out.println("NullPointerException thrown");

Ref: https://bit.ly/3mi39Nr


We are closing our Disqus commenting system for some maintenanace issues. You may write to us at reach[at]yahoo[dot]com or visit us at Facebook