C语言 C语言中是否有计算度数/弧度的函数？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/14920675/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Is there a function in C language to calculate degrees/radians?
提问by Antun Tun
I need to calculate an angle in C programm. Here is a method from JAVA that I need to convert to C.
我需要在 C 程序中计算一个角度。这是我需要转换为 C 的 JAVA 方法。
private static double calculateDirection(double x, double y)
{
return Math.toDegrees(Math.atan2(y, x));
}
Is there a function like toDegrees in C language so I don't have to write all the code by myself? Thank you
C 语言中是否有像 toDegrees 这样的函数，所以我不必自己编写所有代码？谢谢
回答by Emanuele Paolini
#include <math.h>
inline double to_degrees(double radians) {
return radians * (180.0 / M_PI);
}
回答by antonijn
There is no need to use such a method. Converting to degrees is very simple:
没有必要使用这样的方法。转换为度非常简单：
double radians = 2.0;
double degrees = radians * 180.0 / M_PI;
Turn that into a function if you want to.
如果你愿意，把它变成一个函数。
M_PIis* defined in math.hby the way.
M_PIis*math.h顺便定义。
* in most compilers.
* 在大多数编译器中。
回答by Demitri
If your preference is to just copy/paste a couple of macros:
如果您只想复制/粘贴几个宏：
#include <math.h>
#define degToRad(angleInDegrees) ((angleInDegrees) * M_PI / 180.0)
#define radToDeg(angleInRadians) ((angleInRadians) * 180.0 / M_PI)
And if you want to omit the #include, replace that line with this which was copied from the math.hheader:
如果您想省略#include，请将该行替换为从math.h标题中复制的此行：
#define M_PI 3.14159265358979323846264338327950288
