В чем тут ошибка?

//---------------------------------------------------------------------------
 
#include <vcl.h>
#include <string.h>
#include <iostream.h>
#pragma hdrstop
 
#include "Unit1.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
        : TForm(Owner)
{
}
void __fastcall TForm1::Button1Click(TObject *Sender)
{
float o,p,r,k,l;
 
o=StrToFloat(Edit1->Text);
p=StrToFloat(Edit2->Text);
r=StrToFloat(Edit3->Text);
 
std::vector< double > p;
 std::istringstream stream(Edit2->Text.c_str());
 for( std::istream_iterator< std::string > it( stream ), end; it != end;
 ++it )
 {
      p.push_back( StrToFloat( it->c_str() ) );
 }
 
 double e = 0;
 for( size_t i = 0; i < p.size(); ++i )
 {
      e += ( o - p[i] ) * r;
 }
 
 Panel1->Caption = FloatToStr( e );
}
//---------------------------------------------------------------------------

std::istringstream stream(Edit2->Text.c_str());

std::istringstream stream(Edit2->Text.c_str());
 for( std::istream_iterator< std::string > it( stream ), end; it != end;
 ++it )
 {
      p.push_back( StrToFloat( it->c_str() ) );
 }

std::istringstream stream(AnsiString(Edit2->Text).c_str());
 for( std::istream_iterator< std::string > it( stream ), end; it != end;
 ++it )
 {
      double d;
      stream>> d;
      p.push_back( d );
 }