Java Float isNaN() method

The isNaN() method of Java Float class returns a Boolean value for the specified float object or for 'v'. This method returns true if the argument passed is Not a Number (NaN), else returns false.

Syntax:

1.public static boolean isNaN(float v)
2.public boolean isNaN()

Parameters:

The parameter passed is 'v' which is of float type.
NA

Return Value:

This method returns a Boolean value for this float object.

Returns true, if the argument passed is NaN (Not-a-Number).
Returns false, if the arguments passed is anything other than Nan.

Example 1

public class FloatIsNaNExample1 {
    public static void main(String[] args) {
        Float f1 = 0f;
        Float f2 = new Float(f1/0.0);
        System.out.println("1. "+f2+" value = "+f2.isNaN());
        //calling static NaN() method
         Float f3 = Float.NaN;
         Boolean b1 = Float.isNaN(f3);
        System.out.println("2. "+f3+" value = "+b1);

        //directly calling static Nan() method in println function
        Float f4=0.00000000001f/0.0000000001f;
        System.out.println("3. "+f4+" value = "+Float.isNaN(f4));

    }
    }

Test it Now

Output:

1. NaN value = true
2. NaN value = true
3. 0.1 value = false

Example 2

import java.util.Scanner;

public class FloatIsNaNExample2 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("Enter two float no.\n1. Enter Positive float number = ");
        Float f1 = scanner.nextFloat();
        float f2 = (float) Math.sqrt(f1);
        System.out.println("Ans. Square root of " + f1 + " value = " + f2);

        System.out.println("2. Enter Negative float number =");
        Float f3 = scanner.nextFloat();
        float f4 = (float) Math.sqrt(f3);
        // cube root of negative isNan
        if (Float.isNaN(f4)) {
            System.out.println("Ans. Square root of " + f3 + " value = " + f4);
        }
        else{
            System.out.println("Plz enter a negative integer.");
        }
    }
}

Test it Now

Output:

Enter two float no.
1. Enter Positive float number = 
89
Ans. Square root of 89.0 value = 9.433981
2. Enter Negative float number =
-956
Ans. Square root of -956.0 value = NaN

Example 3

import java.util.Scanner;

public class FloatIsNaNExample3 {
    public static void main(String[] args) {


        Scanner scanner = new Scanner(System.in);
        System.out.println(" Enter Positive float number = ");
        Float f1 = scanner.nextFloat();
        //returns a NaN value
        Float f2 = f1/0.0f - f1/0.0f;
        System.out.println("1. "+f1+"/0.0 - "+  f1+"/0.0 = "+f2+" value is " +f2.isNaN());
        //isNaN() method will return true
        Float f3 = f1/0.0f * 0.0f;
        System.out.println("2. "+f1+"/0.0 *"+ " 0.0 = "+f3+" value is " +f3.isNaN());
       //calling static isNaN() method
        Float f4 = f1*0f / 0f;
        System.out.println("3. "+f1+"*0.0 / "+  "0.0 = "+f4+" value is " +Float.isNaN(f4));

        Float f5 = Float.NaN - 768943453;
        System.out.println("4. "+Float.NaN+" - 768943453"+ " = "+f5+" value is " +f5.isNaN());

    }
}

Test it Now

Output:

Enter Positive float number = 
767
1. 767.0/0.0 - 767.0/0.0 = NaN value is true
2. 767.0/0.0 * 0.0 = NaN value is true
3. 767.0*0.0 / 0.0 = NaN value is true
4. NaN - 768943453 = NaN value is true

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