Java acos Function

The Java acos function is one of the Java Math Library function which is used to calculate the trigonometric Arc cosine for the specified expression. Arc cosine is also called as inverse of a cosine. We already explained the Math.cos function in our previous article so, Please refer Java cos Function article to understand the Cosine Function. In this article we will show you, How to use Math.acos function in Java Programming language with example.

Java acos Function Syntax

The basic syntax of the Math.acos in Java Programming language is as shown below.

Number: It can be a double value or a valid numerical expression for which you want to find Arc cosine value.

• If the number argument is positive or negative number, Math.acos function will return the Arc Cosine value.
• If the number argument is Not a number or outside the range -1 and 1, Math.acos function will return NaN.

Java acos Function Example

The Java Math.acos Function allows you to find the trigonometric Arc Cosine for the numeric values. In this Java program, We are going to find the Arc Cosine values of both of both positive and negative values and display the output

JAVA CODE

OUTPUT

ANALYSIS

First, We declared variable x of type Double and used the Java Math.acos function directly on expression. Here, we used System.out.println statement to print the Arc cosine result as output.

Next, We used the Math.acos Function directly on Positive double values. If you observe the above screenshot, Output of Math.acos (1.58) is giving NaN because argument value is greater than 1

Next, We used the Math.acos Function directly on Negative double values. If you observe the above screenshot, Output of Math.asin (-2.50) is giving NaN because argument value is not in the range -1 and 1

Next, We declared variable of type Double and assigned the value. Here, we used the Math.toRadians function to convert 45 into equivalent radiant. Lastly, we used System.out.println statement to print the result as output.

Java acos on Array example

In this Java program we will show you, How to find the Arc cosine values of bulk data. Here, we are going to declare an array of double type and find the arc cosine values of an array elements.

JAVA CODE

OUTPUT

ANALYSIS

First, We declared a double Array and assigned some random values.

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 < myArray.length) and If the condition results True then statement inside the for loop will be executed.

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

Following statements will print the output. If you observe the code snippet, we used the Math.acos Function directly inside the System.out.format statement. Here, compiler will call the Math.acos method ( static double acos(double number) ) to find the corresponding Arc Cosine values.

NOTE: If you want to find the Arc Cosine value of a single item then use:  Math.acos(myArray[index_position])

Java acos Function on Arraylist example

In this Java program we are going to declare an arraylist of double type and find the Arc cosine values of list elements.

JAVA CODE

OUTPUT

ANALYSIS

First, We declared an ArrayList of double type and assigned some random values. While adding the list items we used Math.PI constant (its value is approximately 3.14)

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

Following statement will print the output. If you observe the code snippet, we used the Math.acos Function directly inside the System.out.format statement. Here, compiler will call the java math.acos method ( static double acos(double x) ) to find the corresponding Arc Cosine values.

NOTE: If you observe the above screenshot,

• Output of the Math.acos (Math.PI) is giving NaN. This is because 3.14 is greater than 1
• Output of the Math.acos (Math.PI / 3) is giving NaN. This is because 3.14 / 3 = 1.05, which is greater than 1

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