StrictMath atan2() Method in Java
The java.lang.StrictMath.atan2() is an inbuilt method in java which is used to calculate arc tangent of ordinate_val/abscissa_val in the range between -pi and pi. It returns the angle from the conversion of rectangular coordinates (abscissa_val, ordinate_val) to polar coordinates (p, angle).
- The result is the double value closest to -pi when the abscissa_val is negative zero and the ordinate_val is negative, or the abscissa_val is negative and finite and the ordinate_val is negative infinity.
- The result is the double value closest to pi/4 when both arguments are positive infinity.
- The result is NaN when either argument is NaN.
- The result is positive zero when the abscissa_val is positive zero and the ordinate_val is positive, or the abscissa_val is positive and finite and the ordinate_val is positive infinity.
- The result is negative zero when the abscissa_val is negative zero and the ordinate_val is positive, or the abscissa_val is negative and finite and the ordinate_val is positive infinity.
- The result is the double value closest to pi when the abscissa_val is positive zero and the ordinate_val is negative, or the abscissa_val is positive and finite and the ordinate_val is negative infinity.
- The result is the double value closest to pi/2 when the abscissa_val is positive and the ordinate_val is positive zero or negative zero, or the abscissa_val is positive infinity and the ordinate_val is finite.
- The result is the double value closest to -pi/2 when the abscissa_val is negative and the ordinate_val is positive zero or negative zero, or the abscissa_val is negative infinity and the ordinate_val is finite.
- The result is the double value closest to pi/4 when both arguments are positive infinity.
- The result is the double value closest to 3*pi/4 when the abscissa_val is positive infinity and the ordinate_val is negative infinity.
- The result is the double value closest to -pi/4 when the abscissa_val is negative infinity and the ordinate_val is positive infinity.
- The result is the double value closest to -3*pi/4 when both arguments are negative infinity.
Syntax :
public static double atan2(double abscissa_val, double ordinate_val )
Parameters: The method accepts two parameters:
- ordinate_val: This is of double type which is the ordinate.
- abscissa_val:This is of double type which is the abscissa.
Return Value: The method returns the theta component of the point (p, angle) in polar coordinates that corresponds to the point (abscissa_val,ordinate_val).
Below programs illustrate the java.lang.StrictMath.atan2() method:
Program 1:
java
// Java program to illustrate the // java.lang.StrictMath.atan2() import java.lang.*; public class Beginner{ public static void main(String[] args) { double abs_val = 0.3 , ord_val = 50.00 ; // It returns the theta component // in polar coordinates double atan2val = StrictMath.atan2(abs_val, ord_val); System.out.println("Arc tangent value is: " +atan2val); } } |
Output:
Arc tangent value is: 0.00599992800155516
Program 2:
java
// Java program to illustrate the // java.lang.StrictMath.atan2() import java.lang.*; public class Beginner{ public static void main(String[] args) { double abs_val = 0.3 , ord_val = - 50.00 ; // It returns the theta component // in polar coordinates double atan2val = StrictMath.atan2(abs_val, ord_val); System.out.println("Arc tangent value is: " +atan2val); } } |
Output:
Arc tangent value is: 3.135592725588238
Program 3:
java
// Java program to illustrate the // java.lang.StrictMath.atan2() import java.lang.*; public class Beginner{ public static void main(String[] args) { double abs_val = - 0.3 ,ord_val = 50.00 ; // It returns the theta component // in polar coordinates double atan2val = StrictMath.atan2(abs_val, ord_val); System.out.println("Arc tangent value is: " +atan2val); } } |
Output:
Arc tangent value is: -0.00599992800155516
Program 4:
java
// Java program to illustrate the // java.lang.StrictMath.atan2() import java.lang.*; public class Beginner{ public static void main(String[] args) { double abs_val = - 0.3 , ord_val = - 50.00 ; // It returns the theta component // in polar coordinates double atan2val = StrictMath.atan2(abs_val, ord_val); System.out.println("Arc tangent value is: " +atan2val); } } |
Output:
Arc tangent value is: -3.135592725588238