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What is Math.atan() in Java?

Tarun Telang

Grokking Modern System Design Interview for Engineers & Managers

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Java has a built-in Math class, defined in the java.lang package, which contains important functions to perform basic mathematical operations.

The class has the atan() method, which is used to compute an arctan\arctan or tan1\tan^{-1} (pronounced as “inverse tangent”) of the specified value.

If tan(θ)tan(\theta) is x then tan1tan^{-1}(x) or arctan(x)arctan(x) is θ\theta.

Method definition

public  static double atan(double value);

Parameter

value represents the double value for which we have to find the arc tangent.

Return value

The function returns the double value corresponding to the arctangent of the value. The returned value will lie within the range π/2\pi/2 to π/2-\pi/2.

Note: Math.PI is a constant equivalent to π\pi in Mathematics.

If the value is infinity or NaNnot a number, then the returned value is NaN.

Note: To convert an angle measured in radians to an equivalent angle measured in degrees and vice versa, you can use the built-in Math.toDegrees(double angle_in_randians) and Math.toRadians(double angle_in_degrees) methods.

Code

class HelloWorld {
public static void main( String args[] ) {
double result = Math.atan(1);
System.out.println("atan(1) = " + result);
result = Math.atan(0);
System.out.println("atan(0) = " + result);
result = Math.atan(0.48);
System.out.println("atan(0.48) = " + result);
result = Math.atan(0.66);
System.out.println("atan(O.66) = " + result);
result = Math.atan(0.8);
System.out.println("atan(0.8) = " + result);
result = Math.atan(1);
System.out.println("atan(1) = " + result);
result = Math.atan(Double.NaN);
System.out.println("atan(NaN) = " + result);
result = Math.atan(Double.POSITIVE_INFINITY);
System.out.println("atan(∞) = " + result);
}
}
Example code for Math.atan() in Java

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java
communitycreator
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Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

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