import java.lang.Math;

public class testNaN
{
    public static void main(String[] args)
    {
	double x, y, z;

	x = 0.0;
	y = 0.0;
	z = x/y;		// generate a NaN

	System.out.println("This line should read: 0.0/0.0 -> NaN");
	System.out.println(x + "/" + y + " -> " + z);

	if (z == z)
	   System.out.println("Incorrect comparison of NaNs with ==");
	if (z != z)
	   System.out.println("Correct comparison of NaNs with !=");

	if (!Double.isNaN(z))
	   System.out.println("Incorrect test of NaN with isNaN()");
	if (Double.isNaN(z))
	   System.out.println("Correct test of NaN with isNaN()");
    }
}