sumton.txt

java的一经典教程

// Program to compute the sum of numbers from 0 to n
// where n is entered by the user

import javax.swing.JOptionPane;

public class SumToN
{

   public static void main(String[] args)
   {
	  int counter = 0;
	  int total = 0;

	  String numStr;

	  numStr = JOptionPane.showInputDialog(
	     "Enter a value for n:" );
	  int n = Integer.parseInt(numStr);

	  while (counter <= n)
	  {
	   	total += counter;
	   	counter++;
	  }
	  JOptionPane.showMessageDialog(null,
	     "Sum to " + n + " is " + total);

      System.exit(0);
   }
}