C语言中arctan()函数的使用示例有哪些

1. 计算角度的反正切值：

#include <stdio.h>
#include <math.h>

int main() {
    double angle = 45.0;
    double result = atan(angle * M_PI / 180); // 将角度转换为弧度
    printf("The arctan of %f is %f radians\n", angle, result);
    return 0;
}

2. 计算直角三角形的角度值：

#include <stdio.h>
#include <math.h>

int main() {
    double adjacent = 3.0;
    double opposite = 4.0;
    double angle = atan(opposite / adjacent) * 180 / M_PI; // 计算反正切值并将弧度转换为角度
    printf("The angle of the right triangle is %f degrees\n", angle);
    return 0;
}

3. 计算两点之间的夹角：

#include <stdio.h>
#include <math.h>

int main() {
    double x1 = 1.0, y1 = 1.0;
    double x2 = 2.0, y2 = 2.0;
    
    double angle = atan((y2 - y1) / (x2 - x1)) * 180 / M_PI; // 计算两点之间的夹角
    printf("The angle between the two points is %f degrees\n", angle);
    return 0;
}