C C++ interview questions : What is pure virtual function? or what is abstract class?

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C C++ interview questions

What is a container class? view answer
What is an orthogonal base class? view answer
What is a node class? view answer
Name some pure object oriented languages. view answer
What are proxy objects? view answer
What are the conditions that have to be met for a condition to be an invariant of the class? view answer
Define precondition and post-condition to a member function. view answer
What do you mean by Stack unwinding? view answer
What is class invariant? view answer
What is a Null object? view answer
What is an adaptor class or Wrapper class? view answer
Differentiate between the message and method. view answer
What is a dangling pointer? view answer
*i=0; view answer
int *i=0x400 // answer = ? view answer
What is an incomplete type? view answer
List out some of the object-oriented methodologies. view answer
List out some of the OODBMS available. view answer
What is an Iterator class? view answer
What is the use of ?using? declaration. view answer
Define namespace. view answer
When does a name clash occur? view answer
Differentiate between a template class and class template. view answer
What is an accessor? view answer
What is a modifier? view answer
How do you find out if a linked-list has an end? (i.e. the list is not a cycle) view answer
How do you write a function that can reverse a linked-list? view answer
Can a copy constructor accept an object of the same class as parameter, instead of reference of the object? view answer
What is a local class? Why can it be useful? view answer
hat is a nested class? Why can it be useful? view answer
What are the access privileges in C++? What is the default access level? view answer
What is multiple inheritance(virtual inheritance)? What are its advantages and disadvantages? view answer
How do you access the static member of a class? view answer
What does extern "C" int func(int *, Foo) accomplish? view answer
What are the differences between a C++ struct and C++ class? view answer
Can you overload a function based only on whether a parameter is a value or a reference? view answer
Can you think of a situation where your program would crash without reaching the breakpoint which you set at the beginning of main()? view answer
What is Virtual Destructor? view answer
How can I handle a destructor that fails? view answer
How can I handle a constructor that fails? view answer
What is the difference between const char *myPointer and char *const myPointer? view answer
How are prefix and postfix versions of operator++() differentiated? view answer
What is the difference between a pointer and a reference? view answer
What is name mangling in C++?? view answer
What happens when you make call "delete this;" ?? view answer
What is "this" pointer? view answer
What is Overriding? view answer
What is overloading?? view answer
What is inline function?? view answer
What is a container class? What are the types of container classes? view answer
Name the operators that cannot be overloaded?? view answer
What do you mean by Stack unwinding? view answer
What is a dangling pointer? view answer
What is an Iterator class? view answer
What is the use of 'using' declaration? view answer
What problem does the namespace feature solve? view answer
What is Memory alignment?? view answer
What is pure virtual function? or what is abstract class? view answer
What is virtual function? view answer
When are temporary variables created by C++ compiler? view answer
When do use "const" reference arguments in function? view answer
What is reference ?? view answer
What are storage qualifiers in C++ ? view answer
What is the diff between "new" and "operator new" ? view answer
What is diff between malloc()/free() and new/delete? view answer
What is conversion operator?? view answer
What is conversion constructor? view answer
What is assignment operator? view answer
What is copy constructor? and copy constructors called? view answer
What is default constructor? view answer
What is destructor? view answer
What is constructor or ctor? view answer
What is Polymorphism?? view answer
What is inheritance? view answer
What is encapsulation?? view answer

!!! C C++ interview questions !!!

What is pure virtual function? or what is abstract class?

When you define only function prototype in a base class without and do the complete implementation in derived class. This base class is called abstract class and client won't able to instantiate an object using this base class.
You can make a pure virtual function or abstract class this way..
class Boo
{
void foo() = 0;
}
Boo MyBoo; // compilation error

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C C++ interview questions

!!! C C++ interview questions !!!

What is pure virtual function? or what is abstract class?

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