C++ Programming - Constructors and Destructors - Discussion

Very hard to understand. Thanks all.

Thanks for explaining it.

It depends on the standard. The C++03 standard says constructors cannot be inherited, while C++11 standard says they can:

It is valid in C++11 but not in C++03:

struct As
{
As(int){ }
};

struct Bs : As
{
};
Bs b(2);

It is valid in both:

struct As
{
As(int){ }
};

struct Bs : As
{
Bs(int) : As(int) { }
};
Bs b(2);

Constructor can be inherited:

#include<iostream.h>
#include<conio.h>
class base
{
int a;
public:
base(int a1)
{
a=a1;
cout<<"base's single parameter constructor"<<endl;
}
void show()
{
cout<<" \n a="<<a<<endl;
}
};
class derv: public base
{
int b;
public:
derv( int bb, int aa):base(aa)
{
b=bb;
cout<<" \n Derived's two parameter constructor";
}
void show()
{
base:: show();
cout<<"b="<<b<<endl;
}
};
void main()
{
clrscr();
derv d(10,20);
d.show();
d.base::show();
getch();
}