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。

• 如果传递的参数是NaN，则输出为NaN。
• 如果传递的参数是0，那么结果也是一个0，保留与参数相同的符号。

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 = 0.61
Output: 0.5477400137159024

Input: num = 0.0
Output: 0.0

Input: num = -71.0
Output: -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 = 0.6107259643892086
The arc tangent of 55.0 = 1.5526165117219184
The 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 = -0.4795192919925962
The arc tangent of -71.0 = -1.5567127509720364
The arc tangent of 0.0 = 0.0