strictmath_Java StrictMath atan（）方法与示例

左手的ㄟ右手 2023-03-05 13:29 123阅读 0赞

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## StrictMath类atan()方法 **(**StrictMath Class atan() method**)** ##

*  **atan() method** is available in java.lang package.
    
    **atan()方法**在java.lang包中可用。
 *  **atan() method** is used to return the **arc tangent** of an angle of the given parameter in the method. Here, atan stands for **arc tangent** of an angle.
    
    **atan()方法**用于返回**方法**中给定参数的角度的**反正切** 。 在此，atan代表一个角度的**反正切** 。
 *  **atan() method** is a static method so it is accessible with the class name and if we try to access the method with the class object then we will not get an error.
    
    **atan()方法**是一个静态方法，因此可以使用类名进行访问，如果尝试使用类对象访问该方法，则不会收到错误。
 *  In this method, we pass only radians type argument (i.e. First we convert given argument in radians by using toRadians() method of Math class then after we will pass the same variable in atan() method).
    
    在此方法中，我们仅传递弧度类型的参数(即，首先，我们使用Math类的toRadians()方法将给定参数转换为弧度，然后在atan()方法中传递相同的变量)。
 *  **atan() method** does not throw any exception.
    
    **atan()方法**不会引发任何异常。
 *  In this method, the meaning of **arc tangent** is the inverse or reverse tangent of the given argument.
    
    在此方法中， **反正切**的含义是给定参数的反正切或反正切。
 *  The range of atan() lies – PI/2 through PI/2.
    
    atan()的范围为– PI / 2至PI / 2。

**Syntax:**

**句法：**

public static double atan(double d);

**Parameter(s):**

**参数：**

*  double d – represents a double type value whose **arc tangent** value to be found.
    
    double d –表示要找到其**反正切**值的double类型值。

**Return value:**

**返回值：**

The return type of this method is double – it returns the **arc tangent** of given angle.

此方法的返回类型为double-返回给定角度的**反正切** 。

**Note:**

**注意：**

*  If we pass NaN as an argument, method returns the same value (NaN).
    
    如果我们将NaN作为参数传递，则方法将返回相同的值(NaN)。
 *  If we pass zero (0), method returns the same value with the same sign.
    
    如果传递零(0)，则方法将返回具有相同符号的相同值。

**Example:**

**例：**

// Java program to demonstrate the example of  
    // atan(double d) method of StrictMath Class.
    
    public class Atan {
        
        public static void main(String[] args) {
        
            // variable declarations
            double d1 = -0.0;
            double d2 = Math.PI / 2;
    
            // Display previous value of d1 and d2
            System.out.println("d1: " + d1);
            System.out.println("d2: " + d2);
    
            // Here , we will get (-0.0) because we are 
            // passing parameter whose absolute value is -0.0
            System.out.println("StrictMath.atan(d1): " + StrictMath.atan(d1));
    
            // By using toRadians() method is used to 
            // convert absolute to radians
            d2 = StrictMath.toRadians(d2);
    
            // Display the value of d2 in radians form
            System.out.println("StrictMath.toRadians(d2): " + d2);
    
            // Here we will find arc tangent of d2 by 
            // using atan() method
            System.out.println("StrictMath.atan(d2): " + StrictMath.atan(d2));
        }
    }

**Output**

**输出量**

d1: -0.0
    d2: 1.5707963267948966
    StrictMath.atan(d1): -0.0
    StrictMath.toRadians(d2): 0.027415567780803774
    StrictMath.atan(d2): 0.0274087022410345

> 翻译自: [https://www.includehelp.com/java/strictmath-atan-method-with-example.aspx][https_www.includehelp.com_java_strictmath-atan-method-with-example.aspx]

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