java.lang.Math acos()
Description
- If the argument is NaN or its absolute value is greater than 1, then the result is NaN.
The arc cosine of value is basically just the inverse cosine of a value. To further illustrate this below is the equation.
acos(a) = cos-1a
Most of the methods of the Math class is static and the acos() method is no exception. Thus don’t forget that in order to call this method, you don’t have to create a new object. Use the method in the format Math.acos(a).
Method Syntax
public static double acos(double a)
Method Returns
The acos() method returns the arc cosine of the argument.
Compatibility
Requires Java 1.0 and up
Java Math acos() Example
Below is a java code demonstrates the use of acos() method of Math class. The example presented might be simple however it shows the behavior of the acos() method.
package com.javatutorialhq.java.examples;
import java.util.Scanner;
/*
* This example source code demonstrates the use of
* acos() method of Math class
*/
public class MathAcosExample {
public static void main(String[] args) {
// Ask for user input
System.out.print("Enter a value:");
// use scanner to read the console input
Scanner scan = new Scanner(System.in);
// Assign the user to String variable
String s = scan.nextLine();
// close the scanner object
scan.close();
// get the arc cosine value of the user input
double acosValue = Math.acos(Double.parseDouble(s));
System.out.println("arc cosine of " + s + " is " + acosValue);
}
}
The above java example source code demonstrates the use of acos() method of Math class. We simply ask for user input and we use the Scanner class to parse it. Since we have used the nextLine() method to get the console value, and the return data type is String thus we have used the Double.parseDouble() to transform it into double. We have to convert it first to double because the acos() method accepts double method argument.
Sample Output
Below is the sample output when you run the above example.
