# math.NaN() Function in Golang With Examples

Go language provides inbuilt support for basic constants and mathematical functions to perform operations on the numbers with the help of the math package. You get an IEEE 754 “not-a-number” value with the help of NaN() function provided by the math package. So, you need to add a math package in your program with the help of the import keyword to access the NaN() function.

Syntax:

`func NaN() float64`

Example 1:

 `// Golang program to illustrate math.NaN() Function ` ` `  `package main ` ` `  `import ( ` `    ``"fmt"` `    ``"math"` `) ` ` `  `// Main function ` `func main() { ` ` `  `    ``// Getting Not-a-number value ` `    ``// Using NaN() function ` `    ``res := math.NaN() ` ` `  `    ``// Displaying the result ` `    ``fmt.Println(``"Result: "``, res) ` ` `  `} `

Output:

```Result:  NaN
```

Example 2:

 `// Golang program to illustrate math.NaN() Function ` ` `  `package main ` ` `  `import ( ` `    ``"fmt"` `    ``"math"` `) ` ` `  `// Main function ` `func main() { ` `  `  `    ``// Checking whether the given  ` `    ``// value is not-a-number or not ` `    ``// Using NaN() function ` `    ``nvalue := math.NaN() ` `    ``if` `nvalue == math.NaN() { ` `        ``fmt.Println(``"Given value is not-a-number"``) ` `    ``} ``else` `{ ` `        ``fmt.Println(``"Given value is not a not-a-number"``) ` `    ``} ` ` `  `} `

Output:

`Given value is not a not-a-number`

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