Homework 10-24 (1) Lab exponential

import javax.swing.JOptionPane;
public class Exponential
{
public static void main(String[] args)
{
String inputx=JOptionPane.showInputDialog("Enter a number x of exp(x)");
int x=Integer.parseInt(inputx);
String inputn=JOptionPane.showInputDialog("Enter a number n of n!");
int n=Integer.parseInt(inputn);
double i,j,k,a,b,sum=0;
for(i=0;i<=n;i++) { a=1; for(j=i;j>0;j--)
a*=j;
b=1;
for(k=i;k>0;k--)
b*=x;
sum+=(b/a);
}
JOptionPane.showMessageDialog(null,"exp(x) = "+sum);
}
}