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Dead Code
What is dead code? Explain in programmatic way?
mfsi_chinmayb
- Feb 20th, 2012
Hi Dead code (a.k.a Unreachable code),as the name suggests is the portion of the code which is never executed. Point out the word NEVER , as the code above that made the break before that and the exec...
surendrap
- Nov 21st, 2011
Dead code is such a collection of lines of code or code which executes but it its result does not have any significance or affect on output.
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What is function overloading and operator overloading?
Function overloading: C++ enables several functions of the same name to be defined, as long as these functions have different sets of parameters (at least as far as their types are concerned). This capability is called function overloading. When an overloaded function is called, the C++ compiler selects the proper function by examining the number, types and order of the arguments in the call....
MCBod
- Mar 31st, 2010
Overloading basically refers to the provision of second of subsequent version of the same function or operator based on different parameters.In terms of functions each different version of t...
Dhiraj Girdhar
- Jan 1st, 2009
Here are some examples1) Function overloadingclass FuncOver {public: // Constructors can also be overloaded. FuncOver(); &nb...
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Explain the need for "Virtual Destructor".
Niranjan.ambati
- Apr 9th, 2009
Virtual destructor makes sure that all derived objects are deleted first before deleting the base class objects. When base class pointer assigned with Derived class objects, the virtual destructor of ...
jezpops
- Jul 7th, 2008
Virtual destructor is used when deleting an object explicitly using the delete[] keyword. The Virtual destructor ensures that derived classes take on the implicit destructor method.
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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.
C++ Interview Questions
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