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Have you heard of "mutable" keyword?
vladatzar
- Oct 29th, 2010
The mutable storage class specifier is used only on a class data member to make it modifiable even though the member is part of an object declared as const.You cannot use the mutable specifier with names declared as static or const, or reference members.
erahul.ag
- Jul 2nd, 2010
Answer are correct but not perfect.The Crux is:Purpose of 'mutable' is not changing some member's values of a const object at all. (Its a side bug which comes free with functionality.)You may use muta...
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In c++ have a default constructor ?
ganga prasad rao.aloori
- Nov 26th, 2005
Yes in c++ a class can have a default constructor.a default constructor is a constructor which doesn't pass any arguements to it.
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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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What is the difference between Object and Instance?
anujaprasad2002
- Jul 18th, 2006
An object is an instance of a class.Suppose that class name is myclass class myclass{-----}When this myclass is called in mainmain(){ myclass cplus; /cplus is an object of the class m...
Priya Pise
- May 10th, 2006
Hi Ravi Shankar !I m not agree with u completely so can u plz enlight on the Instance again ..
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How to write a program for singleton class?
paulsonpaulc
- Feb 6th, 2007
Both the above methods doesn't meet the purpose. Try thisclass singleton{ private: /*add what ever data members necessary*/ static singleton* obj...
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Find nth node from end of a singly linked list
j_l_larson
- Oct 19th, 2009
node*GetNthFromEnd(node* pHead, int n) { if ( ! pHead ) return NULL; int i = 0; node* p = pHead; node* ...
Apoorv
- Feb 16th, 2007
A simple way out would be..Use two pointers..*traverse and *nth_positionboth initialised to null..While you traverse to the end of the list using *traverse,let *nth_position follow only after n iterat...
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Suppose there is a txt file with following format:Student name Grades in subjectsX ABA+CDA+Y B+CAA+AAthere can be many students with there grades in various subjects. (number of subjects are unknown)Possible values of grade are: A, A+, B, B+, C, D now suppose the file gets corrupted and all '+' are replaced by 'A'Write a program to restore the file
MumblesCrzy
- Sep 24th, 2009
So I don't know if it's possible to make a perfect program, but one that can get a close estimate would go as such.If all the +'s in the files have been changed to A's then the two exa...
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Class X{X(){}X(X &obj){} // supose '=' operator is also overloaded for this class. I am not writing code for that }main(){X a;X b = a;X c(&a);X d;d = a;}What is the difference between a, b, c, d objects ?
burraganesh
- Dec 7th, 2008
For statements Xb =a and X c(a) copy constructor is invoked but with assignment d=a,operator()= is invoked.
swetha
- Feb 20th, 2007
x a; - calls default constructorX b = a; - calls copy constructorX c(a); - calls copy constructorX d; - calls default constructord = a; - calls overloaded = operator.
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Is it possible to implement Polymorphism (either compile time / runtime) in “C” ? If yes how?
Ashwan
- Jul 26th, 2007
Dont have as such idea whether we can explicitly implement the Polymorphism or not.....but internally it gets done incase of "C".Consider the example of printf/scanf.? Both are library functions and?...
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For Polymorphism, which technique is a perfect example in C++?1. Function / Operator Overloading2. Virtual Functions3. Template
VENKATGOPU
- Jun 10th, 2009
For Compile time polymorphism, Function/Operator overloading are good exampleFor Run time polymorphism, Virtual Function is good example.
puneet83
- Mar 30th, 2009
Polymorphism in C++ is broadly classified as :1. Compile time Polymorphism eg. Operator/Funtion Overloading2. Run time polymorphism eg. Virtual functions.Compile time polymorphism is compartively fast...
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How do you calculate mode from an array of integers?
OSaienni
- Sep 11th, 2008
Same as above except using arrays. #include <iostream>#include <algorithm>int main() {int arrNums[] = {1,2,4,5,1,3,4,2,3,4}; //find mode average, mode average is most frequently appearing ...
OSaienni
- Sep 11th, 2008
Below is an example program I wrote to find mode average. Mode average is the most frequently occuring number in a set. I haven't handle the case when there are 2 or more values with the same coun...
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What is the diffrence between static_cast and dynamic_cast in RTTI
dynamic_cast checks for datatype at runtime but static_cast checks at compilation. Is this the only diffrence b/w them or is there anything else? at the time of programming which shud we prefer to call.
Sushant Kadadi
- Feb 5th, 2008
static_cast is used for all conversions that are well defined.Like float to int. double to int etc.dynamic_cast is used for type-safe downcasting. For this one must be working with a truly polymorphic...
ranjini_r
- Jan 23rd, 2008
static_casts can be used to convert parent class to child class and vice - versa but the cast is an error for "unrelated classes".static casts can also be used to convert integral types...
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What is the difference between char str, char *str and char* str ?Explain the meaning of char* or int* ?
berezleon
- Dec 2nd, 2007
Char * str can't store anything --it's just a pointer to a char. If you cout or printf(...) char *str it prints till it finds termination char '';
bornToLose
- Sep 22nd, 2007
Char* is pointer to char which store address of char variableIntI is a pointer to int which store the address of int variable.
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What was the most difficult debug you have ever done?
indrajit_p
- Mar 23rd, 2008
Once there was a BIG fat bug inside my computer which had claws like ...kidding.I recently had to debug an intetioanlly bugged program in a debugging test where a function was being called recursively...
wanttochange
- Jan 10th, 2008
Can be if yr application get hanged...& you don't no even from where u should start debuging...this can be the most difficult
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What happens to the member function in the class when copy constructor is invoked?
sivakumar.v
- Jul 3rd, 2008
Well, the basic answer is not possible to call copy constructor explicitly within a function again. Because, in the member function it tries to shadow the parameter which is defined at the caller side. Hence, we cannot invoke copy constructor inside a function.
bishoy
- Jan 10th, 2008
Member functions, not as a lot of people expect; have only one instance loaded in memory when the program is run. All constructors included copy constructor target loading member variable, but member functions have their single instances always loaded in memory and ready to be called.
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Polymorphism
What are the issue one should care implementing polymorphism.
redleader
- Apr 16th, 2008
In regards to the point of static and dynamic binding, the virtual keyword needs to be used for any functions that need to be dynamically overriden and not statically overloaded.
redleader
- Apr 16th, 2008
The question revolves around polymorphism, and not the general OOP compliance of the language.Care should be taken in regards to early static binding, and late dynamic binding.Object chopping or slici...
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Dangers of public unsigned, diamond-shaped inheritance
What is the danger of using public unsigned integers within a class?In a diamond-shaped inheritance hierarchy, how to ensure that only 1 copy of parent is created?
redleader
- Apr 16th, 2008
There are at least 2 questions here. The latter is answered but not the former.If the initial question is answered, there would be a requirement to highlight what the dangers are for both public unsigned and multiple inheritance.
ap.genius
- Apr 14th, 2008
Duplicate copies can be avoided using 'virtual' keyword while making ancestral class...The example illustrates it better:#include<iostream.h>#include<conio.h>#include<string.h&g...
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Concatenate two circular linked lists
Write a program to concatenate two circular linked lists into a single circular list.
j_l_larson
- Oct 19th, 2009
class node {public: node(int n) : m_n(n) { m_pNext = this; } ~node() {} void SetNext( node* p ) { m_pNext = p; } node* GetNext() const { return m_pNext; }&n...
Bhimasena
- Jul 13th, 2009
Void cat(Node* ll1, Node* ll2){Node* temp = ll1->next;ll1->next = ll2->next;ll2->next = temp;}
C++ Interview Questions
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