Double.IsInfinity() Method in C#

In C#, Double.IsInfinity() is a Double struct method. This method is used to check whether a specified value evaluates to either positive infinity or negative infinity or not. While performing some mathematical operations, it is possible to obtain a result that is either positive infinity or negative infinity. For Example: If any positive value is divided by zero, it results in positive infinity.

Syntax: public static bool IsInfinity (double d);

Parameter:
d: It is a double-precision floating-point number of type System.Double



Return Type: This function return a Boolean value True, if specified value evaluates to either positive infinity or negative infinity, otherwise return False.

Example:

Input  : d = 10 / 0.0 
Output : True

Input  : d = 7.997e307 + 9.985e307
Output : True

Note:

  • If the result of any floating point operation exceeds Double.MaxValue (i.e 1.79769313486232E+308) is considered as Positive Infinity and if the result is less than Double.MinValue (i.e -1.79769313486232E+308) is considered as Negative Infinity.
  • Floating-point operation return Infinity (Positive Infinity) or -Infinity (Negative Infinity) to indicate an overflow condition.

Code: To demonstrate the Double.IsInfinity(Double) Method

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// C# program to illustrate the
// Double.IsInfinity() Method
using System;
  
class GFG {
  
    // Main method
    static public void Main()
    {
  
        // Dividing a Positive number by zero
        // results in positive infinity.
  
        double zero = 0.0;
        double value = 10.0;
        double result = value / zero;
  
        // Printing result
        Console.WriteLine(result);
  
        // Check result using IsInfinity() Method
        Console.WriteLine(Double.IsInfinity(result));
  
        // Result of any operation that
        // exceeds Double.MaxValue 
        // (i.e 1.79769313486232E+308)
        // is Positive infintity
        result = Double.MaxValue + 9.985e307;
  
        // Printing result
        Console.WriteLine(result);
  
        // Check result using IsInfinity() Method
        Console.WriteLine(Double.IsInfinity(result));
  
        // Result of any operation that
        // is less than Double.MinValue 
        // (i.e -1.79769313486232E+308)
        // is Negative infintity
        result = Double.MinValue - 9.985e307;
  
        // Printing result
        Console.WriteLine(result);
  
        // Check result using IsInfinity() Method
        Console.WriteLine(Double.IsInfinity(result));
    }
}

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Output:

Infinity
True
Infinity
True
-Infinity
True


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