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How to create an object such that it should not call constructor by default.
Indrajit
- Jul 22nd, 2007
Virsa's questions, why constuctors cannot be private and the difference between... are not related to the original question at all, and I simply don't understand why people even take the pain of answe...
dasam
- Mar 29th, 2007
Adam is absolutely correct. It is not illegal to make the constructor as private. We generally do this while creating the singleton class patterns.
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What is difference between inline function and ordinary function?
sachin_mundhra
- Jan 28th, 2010
Inline function should be small in terms of line of code. Complier will replace the code whenever inline function gets called.
wow_suraj
- May 2nd, 2008
In case of ordinary function, when calling the function the scope jumps to the function and after return jumps back to the function call statement resulting in some extra execution time. While in case...
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What is the difference between structures and classes in C++?
There is only one difference ,in classes the members are private by default whereas it is not so in structures.
sripudi
- Jan 5th, 2009
There are a lot of differences between Structure & Class in C.But in C++ the only difference is the members structure are by default public where as class members are by default private.Using C++ structure?we can do the OOPS concepts like inheritance
berezleon
- Dec 1st, 2007
Amid, you are talking about "C" structure that knows nothing about classes etc. The only difference between C++ class and struct is default access specifier (private and public respectively)
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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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Count Number of characters using Pointers
Write a program to count the number of characters in a string using pointers.
madhuti
- Sep 29th, 2009
Int main(void) { char* str = "Hellolklklk"; int i=0; for(i=0; *str; i++, str++); printf("count= %dn", i);return 0;}
paindriven
- Jun 12th, 2009
unsigned int charCounter(char const* str){ unsigned int counter = 0; char const* data = str; while (data != NULL && *data != '') { data++; counter++; } return counter;}
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What do you mean by inheritance?
Inheritance is the process of creating new classes, called derived classes, from existing classes or base classes. The derived class inherits all the capabilities of the base class, but can add embellishments and refinements of its own.
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What is encapsulation?
Packaging an object’s variables within its methods is called encapsulation.
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What do you mean by binding of data and functions?
Encapsulation.
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Difference between "C structure" and "C++ structure".
sachin_mundhra
- Dec 18th, 2009
No concept of encapsulation, code is different than the data in case of C structure. This is possible in C++ structure.
samitriani
- Jul 8th, 2008
C does not have limitation access. Structures in C are used to regroup data from different types.In C++ structure have limitation access propreties (private,public protected) with public access as default, can contain methods and can be used as a class.
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What is the use of virtual destructor?
mehulgala177
- Sep 22nd, 2011
You should always keep your destructors virtual when u r dealing with Inheritance. Try this Code :
Code- #include <iostream>
- #include <tchar.h>
- " Destroying Parent
- "" Destroying Child
- "Also try the same code without using virtual keyword before ~Parent() u will see the difference... :)
rimsha
- Jul 27th, 2011
Virtual destructor is used to delete the dynamically allocated memory via a base class ptr.
C Double dimensional arrays
How can double dimensional arrays be dynamically initialized in C ?
Ajay Kanse
- Dec 23rd, 2008
There are multiple ways to do this :1. int **arr = (int**) malloc(nrows * sizeof(int*)); for (i=0 ; i<nrows ; i++) { arr[i]=(...
SomGollakota
- Jun 13th, 2007
If the question is "How to initialize memory that is dynamically allocated for a 2D array", there are a couple different ways.1. Use memset. memset sets a chunk of memory to a given value. U...
1.why constructor can't be virtual?2.what's the difference between destuctor and virtual destructor?
Jos Collin
- Oct 4th, 2011
That's not correct. The VTable will be created completely during compile time itself. The reason why constructor can't be virtual is that the virtual mechanism will work only on completely constructed...
anabarai
- Jul 5th, 2011
There is nothing like Virtual Constructor. The Constructor can’t be virtual as the constructor is a code which is responsible for creating an instance of a class and it can’t be delegated to any other object by virtual keyword means.
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...
What will happen if I say delete this
Faramarz Rabii
- Oct 22nd, 2010
The danger only exists if you do a stack variable. There is no problem if you use a "new" ed object.
sachin_mundhra
- Dec 18th, 2009
Memory corruption/exception. In case object is local(stack) this will corrupt the stack.
C++ without Header files
How we can run our c++ program without header files?
What do you mean by pure virtual functions?
A pure virtual member function is a member function that the base class forces derived classes to provide. Normally these member functions have no implementation. Pure virtual functions are equated to zero. class Shape { public: virtual void draw() = 0; };
sachin_mundhra
- Feb 17th, 2010
Pure Virtual Function is a virtual function having no body.Example :-virtual void Display() = 0 ;
Is there any way to write a class such that no class can be inherited from it. Please include code
What is the difference between c structure and c++ structure
puneet83
- Mar 30th, 2009
In C++ all the members of a structure are public by default as in case of C.However, C++ structures can contain member functions whereas a structure in C can contain only data.Structure in C++ are sim...
answer
- Oct 12th, 2007
C++ structs are classes with default access as public.C++ structs are typesC++ structs require a ;C++ structs support ctors/dtorsC++ structs support explicit access specificationC++ structs support in...
How many parameters can be passed to a function in c++ ?
gill
- Aug 27th, 2011
Arguments passed in a function are stored in the stack rather than the heap. Thus it depends on how much memory does the O.S allocates for stack in your program. There would still be practically no li...
burraganesh
- Dec 7th, 2008
Less than or equal to those mentioned in the prototype.Less when default arguments are also provided in prototype.
Ans