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

#define PI 3.14159265

#define DEG2RAD(x) (x*PI/180)
#define RAD2DEG(x) (x*180/PI)

#define dt 0.00001
#define w 15
#define maxBoat 5.0
#define riverDrag 3.0

int main(void) {
	float t = 0;
	float x = 0, y = 0;
	float vx = -riverDrag, vy = maxBoat;
	float cx = 0, cy = 0;
	float theta = 0;
	
	for(t = 0;y<w;t+=dt) {		
		x += (vx * dt);
		y += (vy * dt);
		
		theta = -atan((w - y) / x);
		vx = -riverDrag + maxBoat * cos(theta);
		vy = maxBoat * sin(theta);
		
		printf("%f,%f,%f\n", t,x, y); 
	}
	
	return 0;
}