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

In this demo I have used NetBeans IDE 8.2 for debugging purpose. But you can use any java programming language compiler as per your availability..

import java.util.Scanner;
public class Javaexcercise {
 public static void main(String[] args) {
 
  int num;  
  Scanner in = new Scanner(System.in);
  System.out.print("Input number: ");
  num = in .nextInt();
  System.out.printf("%d + %d%d  + %d%d%d\n", num, num, num, num, num, num);
 }
}

Result:

Input number: 12

12+ 1212  + 121212