# Single.IsNaN() Method in C# with Examples

The Single.IsNan() method in C# is used to return a value that indicates whether the specified value is not a number (NaN).

## Syntax

The syntax is as follows −

public static bool IsNaN (float f);

Above, the parameter val is a single-precision floating-point number.

## Example

Let us now see an example −

Live Demo

using System;
public class Demo {
public static void Main() {
float f1 = 5.0f/0.0f;
float f2 = 45.5f;
Console.WriteLine("Value1 = "+f1);
Console.WriteLine("Hashcode for Value1 = "+f1.GetHashCode());
Console.WriteLine("TypeCode for Value1 = "+f1.GetTypeCode());
Console.WriteLine("Is Value1 value is positive or negative infinity? = "+Single.IsInfinity(f1));
Console.WriteLine("Is Value1 NaN? = "+Single.IsNaN(f1));
Console.WriteLine("\nValue2 = "+f2);
Console.WriteLine("Hashcode for Value2 = "+f2.GetHashCode());
Console.WriteLine("TypeCode for Value2 = "+f2.GetTypeCode());
Console.WriteLine("Is Value2 value is positive or negative infinity? = "+Single.IsInfinity(f2));
Console.WriteLine("Is Value2 NaN? = "+Single.IsNaN(f2));
}
}

## Output

This will produce the following output −

Value1 = ∞
Hashcode for Value1 = 2139095040
TypeCode for Value1 = Single
Is Value1 value is positive or negative infinity? = True
Is Value1 NaN? = False

Value2 = 45.5
Hashcode for Value2 = 1110835200
TypeCode for Value2 = Single
Is Value2 value is positive or negative infinity? = False
Is Value2 NaN? = False

## Example

Let us now see another example −

Live Demo

using System;
public class Demo {
public static void Main() {
float f1 = 5.0f/0.0f;
float f2 = 0.0f / 0.0f;
Console.WriteLine("Value1 = "+f1);
Console.WriteLine("Hashcode for Value1 = "+f1.GetHashCode());
Console.WriteLine("TypeCode for Value1 = "+f1.GetTypeCode());
Console.WriteLine("Is Value1 value is positive or negative infinity? = "+Single.IsInfinity(f1));
Console.WriteLine("Is Value1 NaN? = "+Single.IsNaN(f1));
Console.WriteLine("\nValue2 = "+f2);
Console.WriteLine("Hashcode for Value2 = "+f2.GetHashCode());
Console.WriteLine("TypeCode for Value2 = "+f2.GetTypeCode());
Console.WriteLine("Is Value2 value is positive or negative infinity? = "+Single.IsInfinity(f2));
Console.WriteLine("Is Value2 NaN? = "+Single.IsNaN(f2));
}
}

## Output

This will produce the following output −

Value1 = ∞
Hashcode for Value1 = 2139095040
TypeCode for Value1 = Single
Is Value1 value is positive or negative infinity? = True
Is Value1 NaN? = False

Value2 = NaN
Hashcode for Value2 = -4194304
TypeCode for Value2 = Single
Is Value2 value is positive or negative infinity? = False
Is Value2 NaN? = True