# 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

 `// 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)); ` `    ``} ` `} `

Output:

```Infinity
True
Infinity
True
-Infinity
True
```

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