С++ ЕНФ / LABA 2 / 2LB2

#include <iostream.h>
#include <conio.h>
#include <math.h>
inline float p(float x, float y);
void main()
{
  clrscr();
  cout<<"proga schitayushaya perimetr parallelogramma \n\n";
  float x=0,y=0;
  cout<<"vvedite dlinu 1 storoni parallelogramma \n\n";
    cin>>x;
  while (x<=0)
   {cout<<"dlina storoni  dolgna bit >0 \n\n";
    cout<<"vvedite dlinu 1 storoni parallelogramma \n\n";
    cin>>x;};
   cout<<"vvedite dlinu 2 storoni parallelogramma \n\n";
    cin>>y;
   while (y<=0)
    {cout<<"dlina storoni  dolgna bit >0 \n\n";
     cout<<"vvedite dlinu 2 storoni parallelogramma \n\n";
     cin>>y;};
   cout<<"perimetr= "<<p(x,y);
   getch();
}
inline float p(float x, float y)
 {return 2*(x+y);}