# Show INFINITY and NaN : double « Data Type « Java

Show INFINITY and NaN

```

/**
* Show INFINITY and NaN
* @author Ian F. Darwin, http://www.darwinsys.com/
* @version \$Id: InfNaN.java,v 1.4 2004/02/09 03:33:57 ian Exp \$
*/
public class InfNaN {
//+
public static void main(String[] argv) {
double d = 123;
double e = 0;
if (d/e == Double.POSITIVE_INFINITY)
System.out.println("Check for POSITIVE_INFINITY works");
double s = Math.sqrt(-1);
if (s == Double.NaN)
System.out.println("Comparison with NaN incorrectly returns true");
if (Double.isNaN(s))
System.out.println("Double.isNaN() correctly returns true");
}
//-
}

```

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