Java Double isNaN() Method with Examples

by Online Tutorials Library July 22, 2022

Java Double isNaN() Method

The isNaN() method of Java Double class returns true:

If the value of this Object is Not-a-Number (NaN).
If the argument passed is Not-a-Number (NaN).
Otherwise, the method returns false.

Syntax

Parameters

1.NA

2.’ v ‘ is the double value to be tested.

Return value

The isNaN() method returns true if the argument specified is Not-a-Number(NaN), else returns false.

Example 1

 public class Double_isNaNMethodExample1 {     public static void main(String[] args) {        Double d1=new Double(7.0/0.0);        Double d2=new Double(0.0-0.0);        Double d3=new Double(55.0*0.0/0.0);        System.out.println(d1 +”-” +d1.isNaN());        System.out.println(d2 +”-” +d2.isNaN());        System.out.println(d3 +”-” +d3.isNaN());     } } 

Test it Now

Output:

Infinity-false 0.0-false NaN-true

Example 2

 import java.util.Scanner; public class Double_isNaNMethodExample2 {     public static void main(String[] args)          Scanner scanner = new Scanner(System.in);         System.out.println(” Enter Positive double number = “);         Double d1 = scanner.nextDouble();         Double d2 = d1/0.0f – d1/0.0f;         System.out.println(“1. “+d1+”/0.0 – “+  d1+”/0.0 = “+d2+” value is ” +d2.isNaN());         //isNaN() method will return true         Double d3 = d1/0.0f * 0.0f;         System.out.println(“2. “+d1+”/0.0 *”+ ” 0.0 = “+d3+” value is ” +d3.isNaN());        //calling static isNaN() method         Double d4 = d1*0f / 0f;         System.out.println(“3. “+d1+”*0.0 / “+  “0.0 = “+d4+” value is ” +Double.isNaN(d4));         Double d5 = Double.NaN – 768943453;         System.out.println(“4. “+Double.NaN+” – 768943453″+ ” = “+d5+” value is ” +d5.isNaN());    } } 

Test it Now

Output:

Enter Positive double number =  323 1. 323.0/0.0 - 323.0/0.0 = NaN value is true 2. 323.0/0.0 * 0.0 = NaN value is true 3. 323.0*0.0 / 0.0 = NaN value is true 4. NaN - 768943453 = NaN value is true BUILD SUCCESSFUL (total time: 8 seconds)

Example 3

 import java.util.Scanner; public class Double_isNaNMethodExample3 {        public static void main(String[] args) {           Scanner scanner = new Scanner(System.in);         System.out.println(“Enter two double no.n1. Enter Positive double number = “);         Double d1 = scanner.nextDouble();         double d2 = (float) Math.sqrt(d1);         System.out.println(“Ans. Square root of ” + d1 + ” value = ” + d2);         System.out.println(“2. Enter Negative double number =”);         Double d3 = scanner.nextDouble();         double d4 = (double) Math.sqrt(d3);         // cube root of negative isNan         if (Double.isNaN(d4)) {             System.out.println(“Ans. Square root of ” + d3 + ” value = ” + d4);         }         else{             System.out.println(“Plz enter a negative integer.”);         }     } } 

Test it Now

Output:

Enter two double no. 1. Enter Positive double number =  94 Ans. Square root of 94.0 value = 9.69536018371582 2. Enter Negative double number = -556 Ans. Square root of -556.0 value = NaN BUILD SUCCESSFUL (total time: 16 seconds)

Next TopicJava Double

byteValue()compare compareTo()double doubleValue()floatValue()intValue()isNaN()java longBitsToDouble()longValue()parseDouble()shortValue()toHexString()toString()valueOf()

Java Double isNaN() Method with Examples

Java Double isNaN() Method

Syntax

Parameters

Return value

Example 1

Example 2

Example 3

Java Collections sort() Method with Examples

Java Float isFinite() method with Examples

You may also like