From aa83b3324cdf16101e32cd568e805f9b090e4996 Mon Sep 17 00:00:00 2001
From: chandra <chandra1123@gmail.com>
Date: Fri, 18 May 2018 16:57:28 -0400
Subject: [PATCH] Nan in Java

Example usage of NaN in Java
---
 .../java/com/baeldung/nan/NaNExample.java     | 81 +++++++++++++++++++
 1 file changed, 81 insertions(+)
 create mode 100644 core-java/src/main/java/com/baeldung/nan/NaNExample.java

diff --git a/core-java/src/main/java/com/baeldung/nan/NaNExample.java b/core-java/src/main/java/com/baeldung/nan/NaNExample.java
new file mode 100644
index 0000000000..d54a749d3f
--- /dev/null
+++ b/core-java/src/main/java/com/baeldung/nan/NaNExample.java
@@ -0,0 +1,81 @@
+package com.baeldung.nan;
+
+/**
+ * Sample usage of NaN.
+ *
+ */
+public class NaNExample {
+
+    public static void main(String[] args) {
+        NaNExample naNExample = new NaNExample();
+        naNExample.demo();
+    }
+
+    void demo() {
+        undefined_operations_produce_NaN();
+        operations_with_no_real_results_produce_NaN();
+        operations_with_NaN_produce_NaN();
+        comparison_with_NaN();
+        check_if_a_value_is_NaN();
+        assign_NaN_to_missing_values();
+    }
+
+    void undefined_operations_produce_NaN() {
+        System.out.println("Undefined Operations Produce NaN");
+        final double ZERO = 0;
+        System.out.println("ZERO / ZERO = " + (ZERO / ZERO));
+        System.out.println("INFINITY - INFINITY = " + (Double.POSITIVE_INFINITY - Double.POSITIVE_INFINITY));
+        System.out.println("INFINITY * ZERO = " + (Double.POSITIVE_INFINITY * ZERO));
+        System.out.println();
+    }
+
+    void operations_with_no_real_results_produce_NaN() {
+        System.out.println("Operations with no real results produce NaN");
+        System.out.println("SQUARE ROOT OF -1 = " + Math.sqrt(-1));
+        System.out.println("LOG OF -1 = " + Math.log(-1));
+        System.out.println();
+    }
+
+    void operations_with_NaN_produce_NaN() {
+        System.out.println("Operations with NaN produce NaN");
+        System.out.println("2 + NaN = " + (2 + Double.NaN));
+        System.out.println("2 - NaN = " + (2 - Double.NaN));
+        System.out.println("2 * NaN = " + (2 * Double.NaN));
+        System.out.println("2 / NaN = " + (2 / Double.NaN));
+        System.out.println();
+    }
+
+    void assign_NaN_to_missing_values() {
+        System.out.println("Assign NaN to Missing values");
+        double salaryRequired = Double.NaN;
+        System.out.println(salaryRequired);
+        System.out.println();
+    }
+
+    void comparison_with_NaN() {
+        System.out.println("Comparison with NaN");
+        final double NAN = Double.NaN;
+        System.out.println("NaN == 1 = " + (NAN == 1));
+        System.out.println("NaN > 1 = " + (NAN > 1));
+        System.out.println("NaN < 1 = " + (NAN < 1));
+        System.out.println("NaN != 1 = " + (NAN != 1));
+        System.out.println("NaN == NaN = " + (NAN == NAN));
+        System.out.println("NaN > NaN = " + (NAN > NAN));
+        System.out.println("NaN < NaN = " + (NAN < NAN));
+        System.out.println("NaN != NaN = " + (NAN != NAN));
+        System.out.println();
+    }
+
+    void check_if_a_value_is_NaN() {
+        System.out.println("Check if a value is NaN");
+        double x = 1;
+        System.out.println(x + " is NaN = " + (x != x));
+        System.out.println(x + " is NaN = " + (Double.isNaN(x)));
+
+        x = Double.NaN;
+        System.out.println(x + " is NaN = " + (x != x));
+        System.out.println(x + " is NaN = " + (Double.isNaN(x)));
+        System.out.println();
+    }
+
+}