typedef struct coordinates{
	int x, y;
} Snake;
Snake snake[100], food;

snake[4].y = ; snake[4].x = ;

snake[3].y = ; snake[3].x = ;

snake[2].y = ; snake[2].x = ;

snake[1].y = ; snake[1].x = ;

snake[0].y = ; snake[0].x = ;

directiondydx
↑ up
-10
↓ dn
+10
← lf
0-1
→ rt
0+1