写出直线度C语言实现算法

以下是C语言实现直线度算法的基本代码：

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

#define PI 3.141592654

int main()
{
    float x1, y1, x2, y2;
    float angle, degrees, radians;

    printf("Enter the coordinates of the first point:\n");
    scanf("%f %f", &x1, &y1);

    printf("Enter the coordinates of the second point:\n");
    scanf("%f %f", &x2, &y2);

    // Calculate the angle between the two points
    radians = atan2(y2-y1, x2-x1);
    degrees = radians * 180 / PI;

    // Calculate the straightness of the line
    angle = fabs(degrees - 180);

    printf("The straightness of the line is: %.2f degrees\n", angle);

    return 0;
}

该代码通过输入两个点的坐标来计算它们之间的直线度，计算过程包括计算两点连线与水平线之间的夹角，然后求出这个角度与180度之间的差值（即直线度）。