#BUG: wrong formula & missing collision and boundary check in HW3

[ccjeff]

Firstly, thanks a lot for sharing the repo. There are some 挑刺 issue i found in the code:

In the code for Nbody simulation, the newton's law formula is missing the M2:
F = G * Nbody[j].w / (distancedistance);
should be replace by:
F = G * Nbody[j].w * Nbody[i].w / (distancedistance);

And since there is no boundary check, if the iteration number is large, there will be few bodies within the display area.🙈

谢谢学长！

[Gullintani]

感谢斧正！🙇🏻