Question

Write a program in JAVA to print the output of the following series :
s = 2 - 4 + 8 - 16 ................ upto n terms.

Answer 1

import java.io.*;
public class Hope {
      public static void main(String[] args) {
            int n = 5;
            double sum = 0;
            for(int i=1; i<=n; i++){
                  double term = (-1)*(Math.pow(-2,i));
                  sum = sum + term;
            }
     
            System.out.println("The sum is " + sum);
       }
}