Series2

package basicjava;

import java.util.Scanner;

public class Serie2 {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        int x,sum1 = 0, sum2 = 0,sum;
        System.out.print("Please enter your last number : ");
        x = input.nextInt();

          for (int i = 1; i <= x; i++) {
            if(i%2 !=0)
            {

                sum1 = sum1 + i;
            }

        }
            for (int i = 1; i <= x; i++) {
            if(i%2 == 0)
            {

                sum2 = sum2 + i;
            }

        }
            sum = sum1 - sum2 ;
            System.out.println("Result : " +sum);

    }

}