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There are some C++ programs that run with some errors on vs2017 and run out in vc6.0. The next program is the one that I am getting errors running on vs2017 and running out on vc6.0. But I have solved the problem by analyzing the source of the error on vs2017 and sharing it as such.

Instance Code:

#include<iostream>.

using namespace std;

class String
{
    public.
    String() { p = NULL; } //define default constructor
    String( char *str); // Declare the constructor.
    void display();
    private.
    char *p; //Character pointer to String
};

String::String( char *str) //define constructor
{
    p = str; // make p point to the real reference string
}
void String::display()
{
    cout << p;
}

int main()
{
    String string1("Helle"); String string2("Book");
    String string2("Book").
    ();
    cout << endl.
    (); cout << endl;
    String string2("Book"); (); cout << endl; (); cout << endl
    cout << endl; return 0;

}

Running it in vs2017 will show

From the error shown in vs2017, it is clear that if you change the formal parameter to a constant pointer, it will match the real parameter, so you can change the source program as follows:

#include<iostream>;
#include<string>


using namespace std.


class String
{
    public.
    String() { p = NULL; } //define the default constructor
    String(const char *str); // Declare the constructor, defining the formal parameter as a constant pointer.
    void display(); //Declare the constructor, defining the formal parameter as a constant pointer.
    private.
    const char *p; //define as a constant object member to point to the string
};


String::String(const char *str) //define constructor
{
    p = str; // make p point to the real reference string
}
void String::display()
{
    cout << p;
}


int main()
{
    String string1("Helle"); String string2("Book");
    String string2("Book").
    ();
    cout << endl.
    (); cout << endl;
    String string2("Book"); (); cout << endl; (); cout << endl
    cout << endl; return 0;

}

This will run out successfully in vs2017