GenerateNaN.java

--D. Thiebaut (talk) 10:12, 26 April 2017 (EDT)

---

GenerateNaN.java

Source Code

/*

*/
import java.util.*;
import static java.lang.Double.NaN;
import static java.lang.Double.POSITIVE_INFINITY;
import static java.lang.Double.NEGATIVE_INFINITY;

public class GenerateNaN {
	public static void main(String args[]) {
		double[] allNaNs = { 0D / 0D, POSITIVE_INFINITY / POSITIVE_INFINITY,
				POSITIVE_INFINITY / NEGATIVE_INFINITY,
				NEGATIVE_INFINITY / POSITIVE_INFINITY,
				NEGATIVE_INFINITY / NEGATIVE_INFINITY, 0 * POSITIVE_INFINITY,
				0 * NEGATIVE_INFINITY, Math.pow(1, POSITIVE_INFINITY),
				POSITIVE_INFINITY + NEGATIVE_INFINITY,
				NEGATIVE_INFINITY + POSITIVE_INFINITY,
				POSITIVE_INFINITY - POSITIVE_INFINITY,
				NEGATIVE_INFINITY - NEGATIVE_INFINITY, Math.sqrt(-1),
				Math.log(-1), Math.asin(-2), Math.acos(+2), };
		System.out.println(Arrays.toString(allNaNs));
		// prints "[NaN, NaN...]"
		System.out.println(NaN == NaN); // prints "false"
		System.out.println(Double.isNaN(NaN)); // prints "true"
	}
}

Output

231b@aurora ~/handout $ javac GenerateNaN.java 
231b@aurora ~/handout $ java GenerateNaN
[NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN]
false
true