---

##
var (a, b, c, x, x_end, dx) := ReadReal6('Введите a, b, c, Xнач, Xкон, dX:');
Println('     X     |      F');

while x <= x_end + 1e-9 do
begin
  var f := (x < 3) and (b <> 0) ? a*x*x - b*x + c : 
           (x > 3) and (b = 0)  ? (x - a) / (x - c) : x / c;
           
  if real.IsInfinity(f) or real.IsNaN(f) then Println($"{x,10:f2} | Деление на 0")
  else Println($"{x,10:f2} | {(Trunc(a*b*c) mod 4 = 0 ? f.ToString('f4') : Trunc(f).ToString),12}");
  x += dx;
end;