Visual wywala błąd

#include "Cliczba.h"
#include <iostream> 
#include "string.h"
using namespace std;


Cliczba::Cliczba(void)
{
	m_fWartosc = 0; 
	AktualizujString();
}


Cliczba::~Cliczba(void)
{
	if(m_csWartoscString!=NULL)
	{
	delete[] m_csWartoscString ;
	m_csWartoscString = NULL ;
	}
}


void Cliczba::Drukuj(void)
{
	cout << m_csWartoscString << endl;
}


void Cliczba::Ustaw_wartosc(double wartosc)
{
	m_fWartosc = wartosc;
	AktualizujString();
}


void Cliczba::AktualizujString()
{
	char buf[100];

	sprintf(buf, "%.*lf", m_iPrecyzja, m_fWartosc);
	if (m_csWartoscString != NULL)
	{
		delete[] m_csWartoscString;
		m_csWartoscString = NULL;
	}
	m_csWartoscString = new char[strlen(buf) + 1];
	strcpy(m_csWartoscString, buf);
}

if (m_csWartoscString != NULL)
	{
		delete[] m_csWartoscString;
		m_csWartoscString = NULL;
	}
```![screenshot-20170321231913.png](//static.4programmers.net/uploads/attachment/58/58d1a6e112f7d.png)![screenshot-20170321231913.png](//static.4programmers.net/uploads/attachment/58/58d1a6e112f7d.png)

#include <iostream>
#include <locale.h>
#include "Cliczba.h"

using namespace std;

int main()
{
	setlocale(LC_ALL, "polish");
	Cliczba liczba(5);
	liczba.Drukuj();
return 0 ; 
} 

class Clibczba
{
   public:
   //....
   private:
   char *m_csWartoscString;
};