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:

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!").
What is the difficulty level of this exercise?
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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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