Java atan() method with Examples

The java.lang.Math.atan() returns the arc tangent of an angle in between -pi/2 through pi/2. If the argument is NaN, then the result is NaN.

Note:If the argument is zero, then the result is a zero with the same sign as the argument.

Syntax :



public static double atan(double a)
Parameter :
a : the value whose arc tangent is to be returned.
Return :
This method returns the arc tangent of the argument.

Example :To show working of java.lang.Math.atan() method.

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// Java program to demonstrate working
// of java.lang.Math.atan() method
import java.lang.Math;
  
class Gfg {
  
    // driver code
    public static void main(String args[])
    {
        double a = Math.PI;
  
        System.out.println(Math.atan(a));
  
        double c = 344.0;
        double d = 0.0;
        double e = -0.0;
        double f = 1.5;
  
        System.out.println(Math.atan(c));
  
        // Input positive zero
        // Output positive zero
        System.out.println(Math.atan(d));
  
        // Input negative zero
        // Output negative zero
        System.out.println(Math.atan(e));
  
        System.out.println(Math.atan(f));
    }
}

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Output:

1.2626272556789115
1.5678893582391513
0.0
-0.0
0.982793723247329



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