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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...
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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.
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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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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.
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C++ without Header files
How we can run our c++ program without header files?
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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 ;
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Is there any way to write a class such that no class can be inherited from it. Please include code
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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...
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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.
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Register Relation
Why p++ is faster than p+1?
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Editorial / Best Answer
sahasranaman- Member Since Jul-2009 | Jul 1st, 2009
p++ is faster because on compilation, it gets translated to three machine instructions, where as p=p+1 needs four machine instructions. All machine instructions take the same time.
For p++, the instructions are:
mov ax,
inc ax
mov,
axFor p = p+ 1, the instructions would be,
mov ax,
mov bx, 1
add bx
mov,
axThis is why p++ is faster than p+1
Mann2920
- Jan 24th, 2011
To perform?i+1?complier has to do:1-Addition i+12-Assignment i=result of additionWhile in case of i++Value is simply increased by 1so i++ is faster
Gargona
- Feb 13th, 2010
Difference in assembler code:--$ diff -uN a2.S a.S--- ++p.S 2010-02-13 15:51:09.000000000 +0200+++ p+1.S 2010-02-13 15:50:30.000000000 +0200@@ -6,7 +6,6 @@&nb...
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What is public, protected, private?
Public, protected and private are three access specifiers in C++. 1. Public data members and member functions are accessible outside the class.2. Protected data members and member functions are only available to derived classes.3. Private data members and member functions can’t be accessed outside the class. However there is an exception can be using friend classes.
ankit
- Jun 26th, 2015
Can we use protected specifier first than public than private in a class definition in c++ by making class
KomalUpadhyay
- Nov 14th, 2009
Private Protected and Public all these are access specifiers.Private Data Members are only available inside classProtected Data Members are only available inside class as well as in derived classes.Public Data members are available everywhere
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Explain how static class member initialized?
sachin_mundhra
- Jan 28th, 2010
Example :- class Base{public:static int data;};int Base :: data = 10 ; // static class member gets initialized.
yzesong
- Jul 31st, 2009
Static variables of a class can only be initialized like this CLASS_NAME::STATIC_VAR_NAME = VAR_VALUE;
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VTable is same for all objects of class. That means it is stored in memory . Can we obtain the address of VTable without creating any object of class?
jwent
- Aug 14th, 2008
Each instance of a class has its own vtable. Its not a predefined place in memory.
wael.salman
- Jul 30th, 2008
When an object is created, a pointer to this vtable, called the virtual table pointer or vpointer, is added as a hidden member of this object (often the first member). The compiler also generates &quo...
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C++ program to expand the given string
C++ program to expand the following string
aa2b4c3d
o/p should be :
aabbccccddd -
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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Can destructor be private?
NikunjSingh
- Feb 23rd, 2012
Destrcutors can be made private to stop user from creating objects on stack. One can still create objects on stack using a static function as member function. But if intention is not to let user crea...
mehulgala177
- Sep 22nd, 2011
YESSSS destructors can be private. Infact this concept is used in Singleton design pattern. So, outsiders cannot delete object of that class. It has to b deleted from the class itself. I know...I...
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It possible to inherit the private member in drived class?
SomGollakota
- Jun 13th, 2007
Inheritance is one thing, access is quite another. For a C++ class,1. Private members - are off limites to everyone except the ones that are declared in one way or the other, inside the class (direct ...
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What are the disadvantages of C++?
ishanaditya
- Sep 1st, 2014
There is nothing really wrong with C++ anymore. The few reservations I had personally have been fixed with the latest C++11 standard: - C++ wasnt really designed for writing multithreaded application...
robertgbjones
- Aug 5th, 2014
Compared to what? C++ is a potentially low-level, close to the metal language, so potential for performance, though perhaps not as much as assembler, conversely its quite hard to learn, and now a big ...
C++ Interview Questions
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