# math.IsNaN() 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. This package provides IsNaN() function which is used to check whether x is an IEEE 754 “not-a-number” value or not. This function return true if x is an IEEE 754 “not-a-number” value. Otherwise, this function will returns false. So, you need to add a math package in your program with the help of the import keyword to access the IsNaN() function.

Syntax:

`func IsNaN(x float64) (is bool)`

Example 1:

 `// Golang program to illustrate  ` `// math.IsNaN() Function ` ` `  `package main ` `   `  `import ( ` `    ``"fmt"` `    ``"math"` `) ` `   `  `// Main function ` `func main() { ` `    `  `// Checking the specified value ` `// is not-a-number or not ` `// Using IsNaN() function ` `a1 := 4.4 ` `res1 := math.IsNaN(a1) ` `fmt.Println(``"Result 1:"``, res1) ` ` `  `a2 := math.NaN() ` `res2 := math.IsNaN(a2) ` `fmt.Println(``"Result 2:"``, res2)     ` `} `

Output:

```Result 1: false
Result 2: true
```

Example 2:

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

Output:

`a is not-a-number`

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