How to implement a change in direction of movement in an infinite loop?

Question

C++ / C#

Good evening everyone. Now I am writing a snake in the console for the sake of interest. The question arose - how can you implement rotations of the snake on pressing, so that the rest of the time it moves in the cycle in the selected direction?

Answer 1

1) if (_khhit())
keystroke;
motion;
2) threads