# Double.IsNegativeInfinity() Method in C#

In C#, Double.IsNegativeInfinity() is a Double struct method. This method is used to check whether a specified value evaluates to negative infinity or not. In some floating point operation, it is possible to obtain a result that is negative infinity. For Example: If any negative value is divided by zero, it results in negative infinity.

Syntax: public static bool IsNegativeInfinity (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 negative infinity, otherwise return False.

Example:

```Input  : d = -5.0 / 0.0
Output : True

Input  : d = -1.5935e250 * 7.948e110
Output : True
```

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

 `// C# program to illustrate the ` `// Double.IsNegativeInfinity() Method ` `using` `System; ` ` `  `class` `GFG { ` ` `  `    ``// Main method ` `    ``static` `public` `void` `Main() ` `    ``{ ` ` `  `        ``// Dividing a negtaive number by zero ` `        ``// results in Negative infinity. ` ` `  `        ``// Dividing a number directly by 0 ` `        ``// produces an error ` `        ``// So 0 is stored in a variable first ` ` `  `        ``double` `zero = 0.0; ` `        ``double` `value = -5; ` `        ``double` `result = value / zero; ` ` `  `        ``// Printing result ` `        ``Console.WriteLine(result); ` ` `  `        ``// Check result using IsNegativeInfinity() Method ` `        ``Console.WriteLine(Double.IsNegativeInfinity(result)); ` ` `  `        ``// Result of floating point operation ` `        ``// that is less than Double.MinValue ` `        ``// is Negative Infinity ` ` `  `        ``result = Double.MinValue * 7.948e110; ` ` `  `        ``// Printing result ` `        ``Console.WriteLine(result); ` ` `  `        ``// Check result using IsNegativeInfinity() Method ` `        ``Console.WriteLine(Double.IsNegativeInfinity(result)); ` `    ``} ` `} `

Output:

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

Note:

• The result of any floating point operation that is less than Double.MinValue (i.e -1.7976931348623157E+308 ) is considered as Negative Infinity.
• Floating-point operation return Infinity (Positive Infinity) or -Infinity (Negative Infinity) to indicate an overflow condition.

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