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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 java.util.Scanner;
public class Solution {
 public static void main(String[] args) {
  Scanner in = new Scanner(System.in);
  System.out.print("Input a positive integer: ");
  int n = in .nextInt();
  int result = (n * (n + 1) / 2) * (1 << (n - 1));
  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:

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

Java Code Editor:

Company:  Bloomberg

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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!").

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Java: Tips of the Day

Java Classes

A Java class is declared with the keywords public class along with a unique class name mirroring its file name. For example, in a file Hello.java in project helloworld:

package helloworld;

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

/**
 * @author seth
 * A GUI hello world.
 */

public class Hello {
        // this is an empty class
}

You can declare variables and functions inside a class. In Java, variables within a class are called fields.

Ref: https://red.ht/3sL3sSl

 





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