Logarithm in java - Java Program to Find Logarithm of a Number

Logarithm in java: In the previous article, we have seen Java Program to find Quotient and Remainder of a Number

In this article we are going to see how to find logarithm of a number using java programming language.

Java Program to Find Logarithm of a Number

Java logarithm: In Java we have inbuilt Math.log() method in java.lang.Math class which can be used to find the logarithm of a number.

Let’s see the program to understand it more clearly.

By Using Math.log() Method (Static Input Value)
By Using Math.log() Method (User Input Value)

Method-1: Java Program to Find Logarithm of a Number By Using Math.log() Method (Static Input Value)

Approach:

Take an integer variable initialized with an integer value.
Then use Math.log() method to find the log_en and Math.log10() to find log_10.

Program:

import java.util.Scanner;

class Main
{
    public static void main(String args[]) 
    {
        //a number declared
        int n = 15;
        System.out.println("Logarithm of " + n + " is " + Math.log(n));
        System.out.println("Logarithm10 of " + n + " is " + Math.log10(n));
    }
}

Output:

Logarithm of 15 is 2.70805020110221
Logarithm10 of 15 is 1.1760912590556813

Method-2: Java Program to Find Logarithm of a Number By Using Math.log() Method (User Input Value)

Approach:

Create scanner class object.
Take user input for the number.
Use Math.log() method to find the log_en and Math.log10() to find log₁₀

Program:

import java.util.Scanner;

class Main
{
    public static void main(String args[]) 
    {
        //Scanner class object created
        Scanner sc = new Scanner(System.in);
        //Taking a number input from user
        System.out.print("Enter the number: ");
        int n = sc.nextInt();
        System.out.println("Logarithm of " + n + " is " + Math.log(n));
        System.out.println("Logarithm10 of " + n + " is " + Math.log10(n));
    }
}

Output:

Enter the number: 5
Logarithm of 5 is 1.6094379124341003
Logarithm10 of 5 is 0.6989700043360189

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