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

void drawTree(int d, double x, double y, double r, double t) {
    /* d       --- 再帰呼出しの深さ */
    /* (x, y)  --- 枝の根元の座標 */
    /* r       --- 枝の長さ */
    /* t       --- 枝の伸びる向き（ラジアン） */
    double r1;
    if (d == 0) return; /* 打切り */

    printf("%6.3f %6.3f %6.3f %6.3f\n",
            x,    y,    x + r * cos(t), y + r * sin(t));
    r1 = r;
    drawTree(d - 1, x + r1 * cos(t), y + r1 * sin(t), 0.5 * r, t);
    r1 = 0.5 * r;
    drawTree(d - 1, x + r1 * cos(t), y + r1 * sin(t), 0.5 * r, t + M_PI/2);
    r1 = 0.5 * r;
    drawTree(d - 1, x + r1 * cos(t), y + r1 * sin(t), 0.5 * r, t - M_PI/2);
}

int main(void) {

    drawTree(6, 128, 255, 128,  -M_PI / 2);
    return 0;
}