Java StrictMath atan()方法

java.lang.StrictMath.atan() 是StrictMath类中的一个内置方法，用于返回给定参数的正切值。它返回的角度是在-pi/2和pi/2的范围内。它产生了两个特殊的结果。

语法:

public static double atan(double num)

参数。该方法接受一个双倍类型的参数num，它指的是要返回的正切值。

返回值。该方法返回参数的正切弧度值。

例子 :

Input: num = 0.61Output: 0.5477400137159024Input: num = 0.0Output: 0.0Input: num = -71.0Output: -1.5567127509720364

下面的程序说明了java.lang.StrictMath.atan()方法：
程序1：

// Java program to illustrate the// java.lang.StrictMath.atan()import java.lang.*;  public class Geeks {      public static void main(String[] args)    {          double num1 = 0.70, num2 = 55.00, num3 = 0;          double atanValue = StrictMath.atan(num1);        System.out.println("The arc tangent of " +                          num1 + " = " + atanValue);          atanValue = StrictMath.atan(num2);        System.out.println("The arc tangent of " +                          num2 + " = " + atanValue);          atanValue = StrictMath.atan(num3);        System.out.println("The arc tangent of " +                           num3 + " = " + atanValue);    }}

输出:

The arc tangent of 0.7 = 0.6107259643892086The arc tangent of 55.0 = 1.5526165117219184The arc tangent of 0.0 = 0.0

程序2：

// Java program to illustrate the// java.lang.StrictMath.atan()import java.lang.*;  public class Geeks {      public static void main(String[] args)    {          double num1 = -0.52, num2 = -71.00, num3 = 0;          double atanValue = StrictMath.atan(num1);        System.out.println("The arc tangent of " +                            num1 + " = " + atanValue);          atanValue = StrictMath.atan(num2);        System.out.println("The arc tangent of " +                             num2 + " = " + atanValue);          atanValue = StrictMath.atan(num3);        System.out.println("The arc tangent of " +                             num3 + " = " + atanValue);    }}

输出:

The arc tangent of -0.52 = -0.4795192919925962The arc tangent of -71.0 = -1.5567127509720364The arc tangent of 0.0 = 0.0