c++中atan2函数

C ++ atan2()函数 (C++ atan2() function)

atan2() function is a library function of cmath header, it is used to find the principal value of the arc tangent of y/x, where y is the proportion of the y-coordinate and x is the proportion of the x-coordinate , it accepts two arguments (y, x) and returns arc tangent of y/x in radians.

atan2()函数是cmath标头的库函数，用于查找y / x的反正切的主值，其中y是y坐标的比例， x是x坐标的比例，它接受两个参数(y，x)并以弧度返回y / x的反正切。

Syntax of atan2() function:

atan2()函数的语法：

atan2(y, x);

Parameter(s): y, x – are the numbers (proportions of y-coordinate and x-coordinate) to calculate the principal value of the arc tangent of y/x.

参数： y，x –是数字( y坐标和x坐标的比例)，用于计算y / x的反正切的主值。

Return value: double – it returns double type value that is the principal value of the arc tangent of y/x.

返回值： double-返回double类型的值，它是y / x的反正切的主要值。

Example:

例：

Input:    float x = -1.0;    float y = -2.5;        Function call:    atan2(y, x);            Output:    -1.9513

C ++代码演示atan2()函数的示例 (C++ code to demonstrate the example of atan2() function)

// C++ code to demonstrate the example of // atan2() function#include 
    
     #include 
     
      using namespace std;// main() sectionint main(){
       float x;    float y;        x = -1.0;    y = -2.5;    cout<<"atan2("<
      
       <<","<
       
        <<"): "<
        
         <
        
       
      
     
    

Output

输出量

atan2(-2.5,-1): -1.9513atan2(22.5,11): 1.11608atan2(0,-1): 3.14159

Reference:

参考：

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c++中atan2函数