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Sum of Series Program - Java Programs

Write a program to calculate and print the sum of each of the following series:
(a) Sum (S) = 2 – 4 + 6 – 8 + … – 20.
(b) Sum (S) = x / 2 + x / 5 + x / 8 + x / 11 + … + x / 20 where the value of x is to be input by the user.

Java


import java.util.Scanner;
class Series{
    public static void main(String args[]){
        Scanner in = new Scanner(System.in);
        int s1 = 0;
        double s2 = 0.0;
        for(int i = 2; i <= 20; i += 2){
            if(i % 4 == 0)
                s1 -= i;
            else
                s1 += i;
        }
        System.out.println("Series 1 sum: " + s1);
        System.out.print("x = ");
        double x = Double.parseDouble(in.nextLine());
        for(int i = 2; i <= 20; i += 3)
            s2 += x / i;
        System.out.println("Series 2 sum: " + s2);
    }
}

Output

 
 OUTPUT : 
 
Series 1 sum: -10
x = 5
Series 2 sum: 5.480805958747134