С++ ЕНФ / LABA 4 / new / 4LB2

# include <iostream.h>;
# include <conio.h>;
float V(float &, float & ,float &);
void main()
{
  float pi,r,h;
  pi=3.14159265358;
  clrscr();
  cout<<"programma,vychislyayuschaya obyom silindra \n\n" ;
  do
   {cout<<"vvedite radius, on dolgen bit >0 \n";
     cin>>r;}
   while(r<=0);
  do
   {cout<<"vvediye vysotu, ona dolgna bit >0 \n";
     cin>>h;}
  while(h<=0);
  float &ppi=pi, &pr=r,&ph=h;
  cout<<"obyom cilindra = "<<endl ;
  cout<<V(ppi,pr,ph);
  getch();
}
float V(float &ppi, float &pr,float &ph)
{return ppi*pr*pr*ph;}