How to Find Log of Number in Golang

Use the Log() method in the math package of Golang to get the natural logarithm of a number.

func Log(x float64) float64

Parameters: x of type float64
Return: It returns the natural logarithm of x.

In this article, we will discuss different types of logarithms to find the log of a number with examples.

How to Find Log of a Number in Golang using Natural Log

To find the log of a number in Golang, use the Log() function of the math package.

Let’s understand how to get a natural log of a number in go.

package main

import (
	"fmt"
	"math"
)

func main() {
	ans := math.Log(1)
	fmt.Println("Log of 1 is:", ans)

	ans = math.Log(10)
	fmt.Println("Log of number 10 is:", ans)

	ans = math.Log(-2)
	fmt.Println("Log of -2 is:", ans)

	ans = math.Log(0)
	fmt.Println("Log of 0 is:", ans)
}

In the above golang program, we imported a math package and used Log() method to find the natural logarithm for a number.

The output of the above go program is:

Log of 1 is: 0
Log of number 10 is: 2.302585092994046
Log of -2 is: NaN
Log of 0 is: -Inf

Cool Tip: How to get the pi value in golang!

How to Find the Decimal Log of a Number in Golang

To find the decimal log of a number in golang, use the Log10() method of the math package.

Let’s understand how to get a decimal log of a number in go.

package main

import (
	"fmt"
	"math"
)

func main() {
	ans := math.Log10(1)
	fmt.Println("Log10 of 1 is:", ans)

	ans = math.Log10(5)
	fmt.Println("Log10 of number 5 is:", ans)

	ans = math.Log10(-1)
	fmt.Println("Log10 of -2 is:", ans)

	ans = math.Log10(0)
	fmt.Println("Log10 of 0 is:", ans)

}

In the above golang program, we imported a math package and used the Log10() method to find the decimal logarithm for a number in go.

The output of the above go program is:

Log10 of 1 is: 0
Log10 of number 5 is: 0.6989700043360187
Log10 of -2 is: NaN
Log10 of 0 is: -Inf

Cool Tip: How to use the Floor function in golang!

How to Get Binary Exponent Log of a Number in Golang

Use the Logb() method of the math package to get the binary exponent log of a number.

Let’s understand how to get a binary exponent log of a number in go.

package main

import (
	"fmt"
	"math"
)

func main() {
	ans := math.Logb(2)
	fmt.Println("Logb of 2 is:", ans)

	ans = math.Logb(0)
	fmt.Println("Logb of number 0 is:", ans)

	ans = math.Logb(-1)
	fmt.Println("Logb of -1 is:", ans)

	ans = math.Logb(10)
	fmt.Println("Logb of 10 is:", ans)

}

In the above golang program, we imported a math package and used Logb() method to find the binary exponent logarithm for a number in go.

The output of the above go program is:

Logb of 2 is: 1
Logb of number 0 is: -Inf
Logb of -1 is: 0
Logb of 10 is: 3

Cool Tip: How to get the remainder using Golang Modulus!

How to Find the Binary Log of a Number in Go

Use the Log2() method of the math package to get the binary log of a number or the log to base 2 of a number.

Let’s understand how to get a binary log of a number in go.

package main

import (
	"fmt"
	"math"
)

func main() {
	ans := math.Log2(1)
	fmt.Println("Log2 of 1 is:", ans)

	ans = math.Log2(0)
	fmt.Println("Log2 of number 0 is:", ans)

	ans = math.Log2(-1)
	fmt.Println("Log2 of -1 is:", ans)

	ans = math.Log2(10)
	fmt.Println("Log2 of 10 is:", ans)

}

In the above golang program, we imported a math package and used the Log2() method to find the binary logarithm for a number in go.

The output of the above go program is:

Log2 of 1 is: 0
Log2 of number 0 is: -Inf
Log2 of -1 is: NaN
Log2 of 10 is: 3.321928094887362

Conclusion

I hope the above article helped you to understand golang logarithm types, and how to get a decimal log or binary log of a number in golang.

You can find more topics about the Golang tutorials on the GolangSpot Home page.