code

/* Sums  */

import javax.swing.*; //Importing for pretty user input windows

public class Sums //Begin Sums class
{
   public static void main(String args[]) //Begin main method
   {

      // variable Declarations

      int num;
      int total;

      String numString;

      //System welcome
      System.out.println("Welcome to the Sums program that will sum up all the numbers from 1 to your number. ");


      //Getting Input from users

      numString = JOptionPane.showInputDialog("Enter a number greater than or equal to zero");
      num= Integer.parseInt(numString);

      //Validate input (Selection Structure)

      while(num >= 0)
         total = (num * (1 + num)) / 2;
         System.out.println("The sums of the number entered is: " total);

      else
         System.out.println("Invalid number entered: " num);
         numString = JOptionPane.showInputDialog("Enter a number greater than or equal to zero");
         num= Integer.parseInt(numString);

      //Calculate the Sums (Loop)


      //Output the Sums total


      System.exit(0); //Ending program

   } //End main method

} //End Sums