Нелогичная работа кода

//---------------------------------------------------------------------------
#include "LongNumber.hpp"
#include <iostream>
//---------------------------------------------------------------------------
using namespace std;
//---------------------------------------------------------------------------
int main()
{
        LongNumber a;
        a.setdata();
        a.view();
 
        system("pause");
        return 0;
}
//---------------------------------------------------------------------------

#ifndef LONGNUMBER_H
#define LONGNUMBER_H
class LongNumber
{
   private:
        char num[];
        int count;
        int base;
   public:
        LongNumber();
        void setdata();
        void view();
};
#endif

#include "LongNumber.hpp"
#include <iostream>
//---------------------------------------------------------------------------
using namespace std;
//---------------------------------------------------------------------------
LongNumber::LongNumber()
{ }
//---------------------------------------------------------------------------
void LongNumber::setdata()
{
        printf("Enter the count: ");
        scanf("%d", &count);
        printf("Enter the number: ");
        scanf("%s",num);
        printf("Enter the base: ");
        scanf("%d",&base);
}
//---------------------------------------------------------------------------
void LongNumber::view()
{
        printf ("Number = %s \n", num);
        printf ("Count = %d \n", count);
        printf ("Base = %i \n", base);
}
//---------------------------------------------------------------------------