Program to compute sum of first 20 numbers using for loop

/* Program to compute sum of first 20 numbers using for loop */

class ForDemo1
{
    public static void main(String args[])
    {
        int i , sum = 0 ;

        for (i=1 ; i<21 ; i++)
            sum = sum + i ;
        System.out.println("The sum of first twenty numbers is "+sum);
    }
}