class parabola
{private:
	float a,b,c;
 public:
 void vvod()
 {
  printf("Vvedite koeficienti a b c\n");
  scanf("%f%f%f",&a,&b,&c);
 }
 float obrab()
 {
   float v;
   v=-b/(2*a);
   return v;
 }
 void vyvod(float v)
 {
	 if (a>0)
	 {
	 printf("ot ");
	 printf("%1.1f",v);
	 printf(" do +besconechnosti");
	 }

	 if (a<0)
	 {
	 printf("ot -besconechnosti do ",v);
	 printf("%1.1f",v);
	 }
	 if (a==0)
	 printf("TK Vi vveli 0 - eto ne parabola ()");

 } };




#include <stdio.h>
#include "File1.h"
#include <conio.h>
//---------------------------------------------------------------------------


int main()
{
  parabola odin;
  float v;
  odin.vvod();
  v=odin.obrab();
  odin.vyvod(v);
  getch();
  return 0;



}
//---------------------------------------------------------------------------