Write a program to calculate sum and product of even numbers

import java.util.*;
class sumeven
{
public static void main (String arg[])
{
Scanner in = new Scanner (System.in);
int a,s=0,p=1;
System.out.print ("\n\t Enter the ending number = ");
a=in.nextInt();

while (a>0)
{
if (a%2==0)
{
s+=a;
p*=a;
}
--a;
}

System.out.println ("\n\t Sum of even numbers = "+s);
System.out.println ("\n\t Product of even numbers = "+p);
}
}

Note:
         In this program we have used two arithmetic operators in the body of if statement. First
is adding, whatever the value of a, in s and second is multiplying all values of a.