math.Signbit() 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 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