Answer Posted / p govind rao

A destructor can be declare virtual. virtual destructor is
mainly useful during inheritance.

class base
{
public:
base(){}
virtual ~base(){}
};

class derv
{ char *p;
public :
derv(){ptr=nes char[2];}
~derv(){delete ptr;}

} ;

main()
{
base *baseptr=new derv();
delete baseptr;
}

If base class, and derived class, and a dynamically
allocated object of type derived is deleted via a pointer
of type base, then derived's destructor will not be invoked
unless base's destructor is virtual.

base *baseptr = new derv();
delete baseptr; // won't invoke B's destructor unless A's
destructor is virtual

What is operator overloading in c++ example?

1113

---

What are maps in c++?

950

---

Should a constructor be public or private?

1015

---

Which command properly allocates memory a) char *a=new char[20]; b) char a=new char[20]; c) char a=new char(20.0);

1044

---

Describe exception handling concept with an example?

1040

---

What are the differences between the function prototype and the function defi-nition?

1079

---

What is the meaning of c++?

1011

---

How do you clear a buffer in c++?

948

---

What are multiple inheritances (virtual inheritance)? What are its advantages and disadvantages?

1042

---

Why do we use the using declaration?

1156

---

What is null pointer and void pointer and what is their use?

1084

---

What is the importance of mutable keyword?

1019

---

What are dynamic type checking?

1029

---

What is diamond problem in c++?

988

---

What are separators in c++?

1076

---