Java log10 Function

The Java log10 Function is one of the Java Math Library function which is used to return the base 10 logarithmic value of given number. In this article we will show you, How to write Math.log10 function in Java Programming language with example.

Java log10 Function syntax

The basic syntax of the Math.log10 in Java Programming language is as shown below. Following function will accept positive double value as argument and returns the base 10 logarithmic value of the specified expression or Value.

static double log10(double number); //Return Type is Double

// In order to use in program: 
Math.log10(double number);

Number: It can be a double value or a valid numerical expression for which you want to find the base 10 logarithmic value.

If the number argument is positive double value, Math.log10 function will return the logarithm of a given value.
If the number argument is negative double value, Math.log10 function will return NaN.
If the number argument is not a number, java Math.log10 function will return NaN.
If the number argument is positive infinity, Math.log10 function will return the result as Positive Infinity
If the number argument is positive or negative zero, Math.log10 function will return the result as Negative Infinity

Java log10 Function Example

The Java Math.log10 Function allows you to find the base 10 logarithmic value of a specified expression or an individual double value. In this Java program, We are going to find the same and display the output.

JAVA CODE

// Java Math.log10 Function
package MathFunctions;

public class Log10Method {
	public static void main(String[] args) {
		double a = Math.log10(100.90 + 150.10 - 220.50 + 10.50);
		System.out.println("Logarithmic Value = " + a);	

		System.out.println("\nLogarithmic Value of Zero: " + Math.log10(0));
		
		System.out.println("\nLogarithmic Value of Positive Number: " + Math.log10(1));
		System.out.println("Logarithmic Value of Positive Number: " + Math.log10(10.95));
		
		System.out.println("\nLogarithmic Value of Negative Number: " + Math.log10(-8.70));
		System.out.println("Logarithmic Value of Negative Number: " + Math.log10(-5.00));		
	}
}

OUTPUT

ANALYSIS

First, We declared variable of type Double and performed the Math.log10 function directly on expression.

double a = Math.log10(100.90 + 150.10 - 220.50 + 10.50);
System.out.println("Logarithmic Value = " + a);

Next, We used the Math.log10 Function directly on Positive double values.

System.out.println("\nLogarithmic Value of Positive Number: " + Math.log10(1));
System.out.println("Logarithmic Value of Positive Number: " + Math.log10(10.95));

Next, We used the java Math.log10 Function directly on Negative double values. As you can see from the screenshot, it is returning NaN for negative values.

System.out.println("\nLogarithmic Value of Negative Number: " + Math.log10(-8.70));
System.out.println("Logarithmic Value of Negative Number: " + Math.log10(-5.00));

Java log on Array example

In this Java program we will show you, How to find the base 10 logarithmic value of bulk data. Here, we are going to declare an Array of double type and find the base 10 logarithmic value of each and every element in an array.

JAVA CODE

package MathFunctions;

public class Log10MethodOnArrays {
	public static void main(String[] args) {
		
		double [] logArray = {20.35, 54.98, -68.41, -9.5987, -0, 120.38, 14.4897};

		for (int i = 0; i < logArray.length; i++) {
			System.out.format("Logarithmic Value of Array Element = %.4f\n", Math.log10(logArray[i]));
		}
	}
}

OUTPUT

ANALYSIS

First, We declared an Array of double type and assigned some random values.

double [] logArray = {20.35, 54.98, -68.41, -9.5987, -0, 120.38, 14.4897};

Next, We used the Java For Loop to iterate the Array. Within the For Loop, we initialized the i value as 0. Next, compiler will check for the condition (i < logArray.length). As along the condition is True, statement inside the for loop will be executed.

TIP: logArray.length is used to find the length of an array.

for (int i = 0; i < logArray.length; i++) {

Following statements will print the output. If you observe the code snippet, we used the Math.log10 Function directly inside the System.out.format statement. Here, compiler will call the Java Math.log10 method (static double log10(double number)) to find the base 10 logarithmic value of corresponding values.

System.out.format("Logarithmic Value of Array Element = %.4f\n", Math.log10(logArray[i]));

NOTE: If you want to find the base 10 logarithmic value of a single item then use: Math.log10(myArray[index_position])

Java log10 function on Arraylist example

In this Java program we are going to declare an arraylist of double type and find the base 10 logarithmic value of list elements.

JAVA CODE

package MathFunctions;

import java.util.ArrayList;

public class Log10MethodOnArrayList {
	public static void main(String[] args) {
		
		ArrayList<Double> logList = new ArrayList<Double>(5);
		logList.add(1245.998);
		logList.add(-1480.05);
		logList.add(250.9876);
		logList.add(170.01);
		logList.add(2016.98);
		logList.add(-8978.1898);
		
		for (double x : logList) {
			System.out.println("Logarithmic Value of ArrayList =  " + Math.log10(x));
		}
	}
}

OUTPUT

ANALYSIS

First, We declared an ArrayList of double type and assigned some random values.

ArrayList<Double> logList = new ArrayList<Double>(5);
logList.add(1245.998);
logList.add(-1480.05);
logList.add(250.9876);
logList.add(170.01);
logList.add(2016.98);
logList.add(-8978.1898);

Next, We used the For Loop to iterate the double values in ArrayList

for (double x : logList) {

Following statements will print the output. If you observe the code snippet, we used the Math.log10 Function directly inside the System.out.format statement. Here, compiler will call the java Math.log10 method ( static double log10(double x) ) to find the base 10 logarithmic value of corresponding values.

System.out.println("Logarithmic Value of ArrayList =  " + Math.log10(x));

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