class MainClass {
public static void main(String[] args) {
double num1 = -0.0;
double num2 = 0.0;
double sqrPos = Math.sqrt(4.0);
double sqrNeg1 = Math.sqrt(-4.0);
double sqrNeg2 = Math.sqrt(-9.0);
System.out.println("Using == to compare 0.0 and -0.0 ");
if (num1 == num2)
System.out.println("numbers are equal");
else
System.out.println("numbers are not equal");
Double n1 = new Double(num1);
Double n2 = new Double(num2);
System.out.println("Using equals() method to compare 0.0 and -0.0 ");
if (n1.equals(n2))
System.out.println("numbers are equal");
else
System.out.println("numbers are not equal");
Double sp1 = new Double(sqrPos);
Double sn1 = new Double(sqrNeg1);
Double sn2 = new Double(sqrNeg2);
System.out.println("Using equals() method to compare two NaNs ");
if (sn1.equals(sn2))
System.out.println("NaNs are equal");
else
System.out.println("NaNs are not equal");
}
}