Java - Float isNaN(float) method

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Description

The Java Float isNaN(float v) method returns true if the specified number is a Not-a-Number (NaN) value, false otherwise.The argument v is the value to be tested.

Declaration

Following is the declaration for java.lang.Float.isNan(float) method

 public static boolean isNaN(float v) 

Parameters

v − This is the value to be tested.

Return Value

This method returns true if the value of the argument is NaN; false otherwise.

Exception

NA

Checking If a float value Carries a NAN Value Example

The following example shows the usage of Float isNaN() method to check if a float value carries a NaN value. We've initialized a float value with an expression which result in positive infinity. Then using isNaN() method, we're checking its value.

 package com.tutorialspoint; public class FloatDemo { public static void main(String[] args) { float f = (float) (1.0/0.0); // returns true if NaN System.out.println(f + " = " + Float.isNaN(f)); } } 

Output

Let us compile and run the above program, this will produce the following result −

 Infinity = false 

Checking If a float value Carries a NAN Value Example

The following example shows the usage of Float isNaN() method to check if a float value carries a NaN value. We've initialized a float value with an expression which result in negative infinity. Then using isNaN() method, we're checking its value.

 package com.tutorialspoint; public class FloatDemo { public static void main(String[] args) { float f = (float) (-1.0/0.0); // returns true if NaN System.out.println(f + " = " + Float.isNaN(f)); } } 

Output

Let us compile and run the above program, this will produce the following result −

 -Infinity = false 

Checking If a float value Carries a NAN Value Example

The following example shows the usage of Float isNaN() method to check if a float value carries a NaN value. We've initialized a float value with an expression which result in NAN. Then using isNaN() method, we're checking its value.

 package com.tutorialspoint; public class FloatDemo { public static void main(String[] args) { float f = (float) (0.0/0.0); // returns true if NaN System.out.println(f + " = " + Float.isNaN(f)); } } 

Output

Let us compile and run the above program, this will produce the following result −

 NaN = true 

Checking If a float value Carries a NAN Value Example

The following example shows the usage of Float isNaN() method to check if a Float object carries a NaN value. We've initialized a float value with an expression which result in zero value. Then using isNaN() method, we're checking its value.

 package com.tutorialspoint; public class FloatDemo { public static void main(String[] args) { Float f = new Float(0.0/1.0); // returns true if NaN System.out.println(f + " = " + Float.isNaN(f)); } } 

Output

Let us compile and run the above program, this will produce the following result −

 0.0 = false