# Java: Sum of all the elements from all possible subsets of a set formed by first n natural numbers

## Java Basic: Exercise-193 with Solution

Write a Java program that accepts an integer and sums the elements from all possible subsets of a set formed by the first n natural numbers.

**Sample Solution:**

**Java Code:**

```
// Import Scanner class from java.util package for user input
import java.util.Scanner;
// Main class for the solution
public class Solution {
// Main method to execute the solution
public static void main(String[] args) {
// Create a Scanner object for user input
Scanner in = new Scanner(System.in);
// Prompt the user to input a positive integer
System.out.print("Input a positive integer: ");
// Read the user input as an integer
int n = in.nextInt();
// Calculate the sum of subsets using a mathematical formula
int result = (n * (n + 1) / 2) * (1 << (n - 1));
// Display the result of the sum of subsets
System.out.print("Sum of subsets of n is : " + result);
}
}
```

Sample Output:

Input a positive integer: 25 Sum of subsets of n is : 1157627904

**Flowchart: **

**Java Code Editor:**

**Company:**
Bloomberg

** Contribute your code and comments through Disqus.**

**Previous:** Write a Java program to rearrange the alphabets in the order followed by the sum of digits in a given string containing uppercase alphabets and integer digits (from 0 to 9).

**Next:** Write a Java program to find the all positions of a given number in a given matrix. If the number not found print ("Number not found!").

**What is the difficulty level of this exercise?**

Test your Programming skills with w3resource's quiz.

**Weekly Trends and Language Statistics**- Weekly Trends and Language Statistics