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# Double.IsInfinity() Method in C#

• Last Updated : 10 Oct, 2021

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

## CSHARP

 `// 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 infinity``        ``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 infinity``        ``result = Double.MinValue - 9.985e307;` `        ``// Printing result``        ``Console.WriteLine(result);` `        ``// Check result using IsInfinity() Method``        ``Console.WriteLine(Double.IsInfinity(result));``    ``}``}`
Output:
```Infinity
True
Infinity
True
-Infinity
True```

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