Реализация класса на C++

#include <cstdlib>
#include <iostream>
#include "textbuf.h"
using namespace std;

int main(int argc, char *argv[])

{
    char xstr[20];
    TextBuf textbuf1, textbuf2;
    cin>>xstr;
    textbuf1.SetText(xstr);
    cout << textbuf1.GetText() << endl;
    textbuf2.SetText(textbuf1);
    cout << textbuf2.GetText() << endl;
    textbuf1.LoadFromFile("text.txt");
    cout << textbuf1.GetText() << endl;
    textbuf1.SaveToFile("text2.txt");




    system("PAUSE");
    return EXIT_SUCCESS;
}





#include "textbuf.h"

void TextBuf::SetText(char*str)
{
     int a,i;
delete [] this->text;
a=0;
while (str[a]!=0)
a++;
this->text= new char[a];
a++;
for (i=0; i<a; i++)
this->text[i]=str[i];
}
char*TextBuf::GetText()
{
      char* xstr;
      int b,j;

      b=0;
      while (this->text[b]!=0)
      b++;
      xstr=new char[b+1];
      for(j=0;j<b;j++)
      xstr[j]=this->text[j];
      xstr[b]=0;
      return xstr;
}

TextBuf TextBuf::operator =(TextBuf textbuf1)
{
        int i, a = 0;
        delete [] this->text;
        while (textbuf1.GetText()[a++] != '0');
        this->text = new char[a];
        for (i = 0; i <= a; i++)
                this->text[i] = textbuf1.GetText()[i];
}
void TextBuf::SetText(TextBuf textbuf1)
{
    this->SetText(textbuf1.GetText());
}
void TextBuf::LoadFromFile (char *FileName)
{
    FILE *text_a;
        int i,
    a = 0;
        char ch;
        delete [] this->text;
        text_a = fopen (FileName, "r");
        do {
                fscanf (text_a, "%c", &ch);
                a++;
        } while (!feof (text_a));
        this->text = new char[a];

        fclose (text_a);
        text_a = fopen (FileName, "r");

        for (i = 0; i < a - 1; i++)
        {
                fscanf (text_a, "%c", &ch);
                this->text[i] = ch;
        }
        this->text[a-1] = '\0';
        fclose (text_a);
}

void TextBuf::SaveToFile (char *FileName)
{
        FILE *text_a;
        text_a = fopen (FileName, "w");
        fprintf (text_a, "%s", this->text);
        fclose (text_a);
};




#include <stdio.h>
#include <stdlib.h>

class TextBuf
{
      private:
             char*text;
      public:
             void SetText(char*str);
             void SetText(TextBuf textbuf1);
             void LoadFromFile(char*FileName);
             char*GetText();
             void SaveToFile(char*FileName);
    /*написать в текстбуф с перегрузками и применение м мэйн*/  TextBuf operator = (TextBuf textbuf1);
    /*написать деструктор*/  ~TextBuf(){};
};