Single.IsNaN() Method in C# with Examples

In C#, Single.IsNaN(Single) is a Single struct method. This method is used to check whether the specified floating-point value is not a number (NaN).

Syntax: public static bool IsNaN (float f);

Parameter:
f: It is a single-precision floating-point number of type System.Single.

Return Type: This function returns a boolean value i.e. True, if specified value is not a number(NaN), otherwise returns False.

Example:

// C# program to demonstrate 
// Single.IsNaN(Single) method 
using System; 
  
class GFG { 
  
    // Main Method 
    public static void Main(String[] args) 
    { 
  
        // first example 
        float f1 = 1.0f / 0.0f; 
  
        bool res = Single.IsNaN(f1); 
  
        // printing the output 
        if (res) 
            Console.WriteLine(f1 + " is NaN"); 
        else
            Console.WriteLine(f1 + " is not NaN"); 
  
        // second example 
        // it will give result 
        // NaN 
        float f2 = 0.0f / 0.0f; 
  
        bool res1 = Single.IsNaN(f2); 
  
        // printing the output 
        if (res1) 
            Console.WriteLine(f2 + " is NaN"); 
        else
            Console.WriteLine(f2 + " is not NaN"); 
    } 
} 

Output:

Infinity is not NaN
NaN is NaN

Note:

This method returns false if a Single value is either PositiveInfinity or NegativeInfinity.
Floating point operation returns a NaN to show that the result of the operation is undefined.

Reference:

https://docs.microsoft.com/en-us/dotnet/api/system.single.isnan?view=netstandard-2.1

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