CPE208-Modified Euler's Method

public class EulerModified {
    public static void main(String[] args){
        double a,b,x,y;
        double h;
        int[] n = new int[]{10, 20, 50, 100, 200, 500, 1000};
        a = 0;
        x = b = 1;
        y = x;

        for(int i = 0 ; i < n.length ; i++){
            h = (b-a)/n[i];
            for(int j = 0 ; j < n[i] ; j++){
                y *=(1+h+(0.5*Math.pow(h, 2)));
            }
            if(i < 3)
                System.out.println("n = "+ n[i] +";\t\t"+y+"\terror = "+(Math.E-y)+"\tlog|error| = "+ Math.log10(Math.E-y));
            else
                System.out.println("n = "+ n[i] +";\t"+y+"\terror = "+(Math.E-y)+"\tlog|error| = "+ Math.log10(Math.E-y));
            y = x;
        }
    }
}