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Using Inheritance
Using inheritance, which of the following is not alloweda) Changing implementation of operation in parent by the subclassb) Using implementation of operation in parent class by the subclassc) Using attributes in parent class by the subclassd) Having operations is subclass which do not exist in parent classe) None
ajrobb
- Sep 22nd, 2010
EUsing inheritance, which of the following is not alloweda) Changing implementation of operation in parent by the subclassIf the parent defines a virtual method, the subclass can provide its own imple...
vijay.badola
- Oct 4th, 2009
We can override the implementation of parent class but we cannot change implementation from child class. So 'A' is not correct.
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Reverse A Linked List
What is the most efficient way to reverse a linklist?
shantanu_hbd
- Apr 25th, 2009
#include<iostream.h>#include<stdio.h>#include<conio.h>class Node{ public: int data; Node(int data); Node *next; void display();};Node::Node(int data){&nb...
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Placement New Syntax
How can a C++ developer use the placement new syntax to make new allocate an object of class SomeClass at a particular memory address stored in a pointer type variable named pmem?A. new SomeClass(pmem);B. new(pmem) SomeClass;C. new SomeClass pmem;D. new pmem SomeClass;E. new (pmem, SomeClass);
ajrobb
- Sep 22nd, 2010
BWhere you use placement new, it is important to explicitly call the destructor for the object before re-using the memory.Fred * fred = new(pmem) Fred();...fred->~Fred();fred = 0;George * george(pmem) George();
akash_saxena
- Dec 22nd, 2009
It is B. new(pmem) SomeClass;pmem points to the memory which shall be used.
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Smart Pointers
What is Smart Pointer in C++?
ajrobb
- Sep 23rd, 2010
Something like std::auto_ptr<> template class. These are essential in objects with more than one item on the heap. If a constructor fails, previously allocated objects and base classes are destr...
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What is memory leaking in c++ ?
ajrobb
- Sep 22nd, 2010
A memory leak in C++ is generally caused by not understanding the language.The std::auto_ptr<class> or similar should be used whenever allocating objects on the heap using new. This is essential...
SomGollakota
- Jun 13th, 2007
Memory leak is - dynamically allocating memory and forgeting to free it. In C++, using a new operator to allocate a chunk of memory, and forgetting to delete it. There are several reasons this could o...
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Memory Allocation
Why is it suggested not to use malloc() or calloc() in C++ for memory allocation?
ajrobb
- Sep 22nd, 2010
There may be a clash between malloc() and new as they don't HAVE to use the same heap library routines. Also, for arrays of classe objects, new invokes the default constructor. For single class objects new allows you to choose a different constructor.
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Program Crash
When can it happen that before calling main function itself program gets crashed?
ajrobb
- Sep 22nd, 2010
I agree.However, there is a difference between global and static. Global objects have global linkage and can be referenced anywhere in the program. Static objects can have access restricted to the file or function where they are defined.
THenry
- Sep 8th, 2010
All global static objects will be created before main().Program has problem to instantiate them.
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Binary Search Algorithm
Why Binary Search Algorithm is a device and conquer based algorithm?
mayankjain477
- Sep 21st, 2010
Binary search algorithm is divide and conquer because in this algorithm, we simply reduces the size of search interval to half in each successive iteration by simply compares the mid value to the key...
ManiCPP
- Apr 2nd, 2010
You probably meant 'Divide and Conquer'. This means you can recursively split your problem into smaller problems of the same type, until you reach a stage where you can solve your problem dire...
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What is an object?
Object is a software bundle of variables and related methods. Objects have state and behavior.
srabani_mazumder
- Aug 30th, 2010
The term object means a combination of data and logic that represents some real world entity.
rajangidwani
- Jul 20th, 2009
An object is an instance of the class through which we can access the methods and class variables
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What is defference between constructor and destructor
srabani_mazumder
- Aug 30th, 2010
Like constructor, the destructor is a member function whose name is the same as the class name but is preceded by a tilde. For example the destructor of a class integer can be define as :- ...
ankitagujrati28
- Jul 21st, 2010
Constructor is the member of a class which is called implicitly when the instance of class is created. It allocates the memory to data.Same as destrutor is also a member of a class. It is called implicitly at the end of execution of class. It deallocates the memory.
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What is virtual base class?
daljit.mca
- Aug 25th, 2010
Suppose you have two derived classes B and C that have a common base class A, and you also have another class D that inherits from B and C. You can declare the base class A as virtual to ensure that B and C share the same subobject of A.Dj.Maan
dasam
- Mar 29th, 2007
If we are working with multiple inheritance, it is always better to make the base class as virtual inorder to avoid the multiple copies of the base class data. :)
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What is friend function?
As the name suggests, the function acts as a friend to a class. As a friend of a class, it can access its private and protected members. A friend function is not a member of the class. But it must be listed in the class definition.
charlie02
- Aug 9th, 2010
Friend function is a non-member function, which can?access the private member of a given class, only if it made as the friend of that class.
MCBod
- Mar 31st, 2010
A friend function is a special function that has been granted access to the priovate members of a specific class. The class itself is responsible for declaring the friendship. It is nto affected by in...
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Find Type of Triangle
Write a C++ program to find the type of a triangle by reading three sides of a triangle.
riturajshine
- Jul 13th, 2010
#include<iostream.h>#include<conio.h>void main(){ int a,b,c; cout<<"ENTER THE SIDES OF A TRIANGLE"; if(a==b&&b==c&&a==c)&nb...
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Why array index starts from 0[zero] only?
laxmanmanne
- Jun 23rd, 2010
This boils down to the concept of Binary digits. Take an array size of 64 for example. We start from 0 and end at 63. We require 6 bits.But, if we were to start from 1 and end at 64, we would require 7 bits to store the same number, thus increasing the storage size.
Nisikant
- Jan 30th, 2009
The array is terminated by a NULL character. Hence for array elements the space will be length-1. suppose you have 5 elements in an array. The last position is occupied by NULL character, then space a...
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Base Class Destructor
In C++, which of following statements accurately describe a base class destructor calling a virtual function override of a derived class?A. the base class destructor calls the virtual function of the base class and not of the derived class.B. the base class destructor calls the virtual function override of the derived class through th vtable.C. the C++ compiler maintains the overridden virtual function...
Thunder2010
- Jun 15th, 2010
Explanation:In C++, if you call a virtual function from a constructor or destructor, the compiler calls the instance of the virtual function defined for the class being constructed (for example, Base:...
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Multi-Dimension Array Size
If you need a function that will handle multi-dimensional arrays, you must specify the following sizes inside the square brackets.Choose one answer. a. All sizes except the first dimension b. None of the sizes c. All sizes except the last dimension d. All the sizes
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Exception Handling
Explain the exception handling features of C++ program with a suitable example
prakash77
- May 21st, 2010
C++ has some speical handlers for exception while at run time, they are try......catch.try.....catch....finally.try....throw....catch.When in above 3 cases, exception which is generated caught by CATC...
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Private Inheritance question
Hi I very recently did the C++ online Quiz and was surprised to find that my answer (1) to the following question (below) was incorrect. Is there something I am missing here, or is the answer incorrect. I thought this was the point of Private. "Always inaccessible regardless or derivation access".Apparently (3) in the correct answer! according to the quiz!The private member in derived class ...
j_l_larson
- Oct 19th, 2009
You can if the base class provides public or protected methods that modify its private data. Then derived class can expose this using access specifiers.
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GOD of Two Numbers
Write a C++ program to find the GOD of two numbers
samsam12
- May 6th, 2010
#include using namespace std;int main ( int na, char * args[]){ cout << "God made the integers; all else is the work of man ... Leopold Kronecker" << endl; return 0;}
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Reference Type
Define reference types with example
C++ Interview Questions
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