# math.Signbit() Function in Golang With Examples

Last Updated : 13 Apr, 2020

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 check whether the sign of the specified number is negative or negative zero with the help of Signbit() function provided by the math package. If the sign of the given number is negative, then this function will return true. Otherwise, return false. So, you need to add a math package in your program with the help of the import keyword to access Signbit() function.

Syntax:

`func Signbit(x float64) bool`

Example 1:

 `// Golang program to illustrate Signbit() Function ` ` `  `package main ` ` `  `import ( ` `    ``"fmt"` `    ``"math"` `) ` ` `  `// Main function ` `func main() { ` ` `  `    ``// Using Signbit() function ` `    ``res_1 := math.Signbit(-6) ` `    ``res_2 := math.Signbit(54) ` `    ``res_3 := math.Signbit(math.Inf(-1)) ` `    ``res_4 := math.Signbit(math.NaN()) ` `    ``res_5 := math.Signbit(math.Pi) ` ` `  `    ``// Displaying the result ` `    ``fmt.Println(``"Result 1: "``, res_1) ` `    ``fmt.Println(``"Result 2: "``, res_2) ` `    ``fmt.Println(``"Result 3: "``, res_3) ` `    ``fmt.Println(``"Result 4: "``, res_4) ` `    ``fmt.Println(``"Result 5: "``, res_5) ` ` `  `} `

Output:

```Result 1:  true
Result 2:  false
Result 3:  true
Result 4:  false
Result 5:  false
```

Example 2:

 `// Golang program to illustrate Signbit() Function ` ` `  `package main ` ` `  `import ( ` `    ``"fmt"` `    ``"math"` `) ` ` `  `// Main function ` `func main() { ` ` `  `    ``// Using Signbit() function ` `    ``nvalue := math.Signbit(-34) ` `    ``if` `nvalue == ``true` `{ ` `        ``fmt.Println(``"Sign of the "``+ ` `          ``"given number is negative"``) ` `    ``} ``else` `{ ` `        ``fmt.Println(``"Sign of the given "``+ ` `                ``"number is not negative"``) ` `    ``} ` ` `  `} `

Output:

`Sign of the given number is negative`