Why do I get message "COMPILATION ERROR"??? I compiled my program on
Borland C++Builder 5 compiler and it works.

Here is the source of the program (solving problem 1046):

#include <stdio.h>
#include <math.h>

typedef unsigned short index;

#define MAXPOINTS 50
struct Tpoint {
  double x,y;
};
struct Tvertice {
  double x,y,a;
};
class Tpolygon {
  public:
    index n;
    Tvertice v[MAXPOINTS];
    Tpoint rotatebyv(Tpoint,index);
};
class Tsearcher {
  private:
    Tpolygon*p;
    int inited;
    Tpoint c;
    double pr;
  public:
    Tsearcher(Tpolygon*);
    void init(double);
    int ensearch(void);
    Tpoint getpoint(void);
};

int main(void)
{
  index i; double f;
  Tpolygon p;
  Tsearcher s(&p);
  scanf("%hu",&p.n);
  for (i=0; i<p.n; i++) {
    scanf("%lf",&f); p.v[i].x=f;
    scanf("%lf",&f); p.v[i].y=f;
  }
  for (i=0; i<p.n; i++) { scanf("%lf",&f); p.v[i].a=f; }
  s.init(1e-3);
  while (!s.ensearch());
  Tpoint c=s.getpoint();
  for (i=0; i<p.n; i++) {
    printf("%.0lf %.0lf\n",c.x,c.y);
    c=p.rotatebyv(c,i);
  }
  return(0);
}

Tpoint Tpolygon::rotatebyv(Tpoint p,index i)
{
  Tpoint np;
  double a=v[i].a*M_PI/180;
  p.x-=v[i].x; p.y-=v[i].y;
  np.x=p.x*cos(a)-p.y*sin(a);
  np.y=p.x*sin(a)+p.y*cos(a);
  np.x+=v[i].x; np.y+=v[i].y;
  return(np);
}
Tsearcher::Tsearcher(Tpolygon*P)
{
  p=P;
  inited=0;
}
void Tsearcher::init(double PR)
{
  pr=PR;
  c.x=0; c.y=0;
  inited=1;
}
int Tsearcher::ensearch(void)
{
  index i;
  Tpoint l=c,d;
  for (i=0; i<p->n; i++) c=p->rotatebyv(c,i);
  c.x=(l.x+c.x)/2; c.y=(l.y+c.y)/2;
  d.x=fabs(l.x-c.x); d.y=fabs(l.y-c.y);
  if ((d.x<pr)&&(d.y<pr)) return(1); else return(0);
}
Tpoint Tsearcher::getpoint(void)
{ return(c); }