用c语言编写koch雪花的代码

以下是用C语言编写Koch雪花的代码：

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

void koch(int n, double x1, double y1, double x2, double y2)
{
    if (n == 0) {
        printf("%.2f %.2f\n", x1, y1);
        return;
    }

    double sx = (2 * x1 + x2) / 3;
    double sy = (2 * y1 + y2) / 3;
    double tx = (x1 + 2 * x2) / 3;
    double ty = (y1 + 2 * y2) / 3;
    double ux = (tx - sx) * cos(M_PI / 3) - (ty - sy) * sin(M_PI / 3) + sx;
    double uy = (tx - sx) * sin(M_PI / 3) + (ty - sy) * cos(M_PI / 3) + sy;

    koch(n-1, x1, y1, sx, sy);
    koch(n-1, sx, sy, ux, uy);
    koch(n-1, ux, uy, tx, ty);
    koch(n-1, tx, ty, x2, y2);
}

int main()
{
    int n;
    scanf("%d", &n);

    double x1 = 0, y1 = 0;
    double x2 = 100, y2 = 0;

    koch(n, x1, y1, x2, y2);
    printf("%.2f %.2f\n", x2, y2);

    return 0;
}

代码实现了Koch雪花的绘制，其中koch函数用来递归地绘制每一层的线段，main函数中读入输入的层数n，然后调用koch函数绘制整个雪花。