public Random_middle_tank_action(Tank tank)
{
double r = Rand.NextDouble();
if (r < 0.2)
{
tank.Move_down();
}
else if (r < 0.4)
{
tank.Move_left();
}
else if (r < 0.6)
{
tank.Move_right();
}
else if (r < 0.8)
{
tank.Move_up();
}
else
{
tank.Shoot();
}
}