Чтение символов из строки

#include <iostream>
#include <string>
using namespace std;
 
int main()
{
    string str, temp;
    cin>>str;
    int i=0;
    while (str[i]!='-' && i<str.length())
    {
        temp+=str[i];
        ++i;
    }
    cout<<temp<<endl;
    system("pause");
}

#include <windows.h>
#include <iostream>
#include <string>
using namespace std;
 
 
 
int main()
{
    string mystr;
    char find;
    string insert;
    cin>>mystr;
    cin>>find;
    cin>>insert;
    size_t count=0;
    while (count!=-1) //ВОТ ЭТО УСЛОВИЕ
    {
        count=mystr.find(find,count);
        if (count!=-1)
        {
            mystr.erase(count,1);
            mystr.insert(count, insert);
            count+=insert.length();
        }
    }
    cout<<mystr<<endl;
    system("pause");
    return 0;

//---------------------------------------------------------------------------
 
#include <vcl.h>
#include <string.h>
#include <iostream.h>
#include <windows.h>
#pragma hdrstop
 
#include "Unit1.h"
using namespace std;
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
String *beginmas=new String[100];
String *finalmas=new String[100];
String slovo;
String Rule;
String temp,changer;
size_t level;
int i,j,len,counter=0; // AnsiString Arrow;
 
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
        : TForm(Owner)
{
 
 
}
//---------------------------------------------------------------------------
 
void __fastcall TForm1::BeginEditChange(TObject *Sender)
{//òóò âáèâàåì ñëîâî äëÿ ïðîâåäåíèå äåéñòâèé
slovo=BeginEdit->Text;
}
//---------------------------------------------------------------------------
 
 
 
//---------------------------------------------------------------------------
void __fastcall TForm1::RulesEditKeyPress(TObject *Sender, char &Key)
 
{
//âáèâàåì â ëèñòáîêñ ïðàâèëà ïîäñòàíîâîê
if (GetAsyncKeyState(VK_RETURN))
{len=RulesEdit->Text.Length();
 RulesListBox->Items->Add(RulesEdit->Text);
 counter=counter++;
 RulesEdit->Text="";
}
}
 
//---------------------------------------------------------------------------
 
 
void __fastcall TForm1::Button1Click(TObject *Sender)
{
for (i=0;i==counter;i++)
{temp=RulesListBox->Items->Strings[RulesListBox->ItemIndex];
 while (temp[i]!='-')
    {
        beginmas[i]+=temp;
        ++i;
        finalmas[i]=temp[5];
        finalmas[i]+=temp[6];
    }
 
}
for (j=0;j==counter;j++)
{
 for (i=0;i<=slovo.Length();i++)
 {changer=slovo[i];
  changer+=slovo[i+1];
  if (changer.AnsiCompareIC(beginmas[j])>0)
  {changer=beginmas[j];
  }
 }
}
FinalEdit->Text=slovo;
}
//---------------------------------------------------------------------------

//---------------------------------------------------------------------------
 
#include <vcl.h>
#include <string.h>
#include <iostream.h>
#include <windows.h>
#pragma hdrstop
 
#include "Unit1.h"
using namespace std;
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
AnsiString beginmas[100];
AnsiString finalmas[100];
AnsiString slovo;
AnsiString Rule;
AnsiString temp,changer;
size_t level=0;
int i,j,len;
int counter=0;
 
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
        : TForm(Owner)
{
 
 
}
//---------------------------------------------------------------------------
 
void __fastcall TForm1::BeginEditChange(TObject *Sender)
{//òóò âáèâàåì ñëîâî äëÿ ïðîâåäåíèå äåéñòâèé
slovo=BeginEdit->Text;
}
//---------------------------------------------------------------------------
 
 
 
//---------------------------------------------------------------------------
void __fastcall TForm1::RulesEditKeyPress(TObject *Sender, char &Key)
 
{
//âáèâàåì â ëèñòáîêñ ïðàâèëà ïîäñòàíîâîê
 
 if (GetAsyncKeyState(VK_RETURN))
  {len=RulesEdit->Text.Length();
   RulesListBox->Items->Add(RulesEdit->Text);
   counter=counter++;
   RulesEdit->Text="";
  }
}
 
//---------------------------------------------------------------------------
 
 
void __fastcall TForm1::Button1Click(TObject *Sender)
{for (i=0;i==counter;i++)
 {temp=RulesListBox->Items->Strings[i];
  beginmas[i]=temp.SubString(1,2);//ВОТ ЗДЕСЬ ВИДИМО
  finalmas[i]=temp.SubString(5,2);
  FinalEdit->Text=beginmas[i];
  }
 slovo=StringReplace(slovo,beginmas[i],finalmas[i],TReplaceFlags() << rfReplaceAll);
 FinalEdit->Text=slovo;
}
//---------------------------------------------------------------------------