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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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What is the technique for Fixing Code Errors
grimes13
- Sep 5th, 2011
First off for me there is no one technique.
Generally I do this:
1. Find out what the error is and reproduce it.
2. Create a test that should pass if the error is fixed.
3. Make my code pass that test.
This is not info on how to find a bug but on how I would go about fixing one. -
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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What is the difference between "overloading" and "overriding"?
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Editorial / Best Answer
Answered by: Richa
- Sep 28th, 2005
Overloading a method (or function) in C++ is the ability for functions of the same name to be defined as long as these methods have different signatures (different set of parameters). Method overriding is the ability of the inherited class rewriting the virtual method of the base class.
swarn kant
- Mar 14th, 2006
All the above answers are right this is one more refinement.overridding is runtime polymorphism while overloading is compile time polymorphism.
priya
- Mar 5th, 2006
Overloading: the same function can perform different operations.overridding: the derived class can rewrite the content of the base class.
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Inheritance
Which one of the following statements regarding C++ class inheritance is FALSE?
a. Inheritance promotes generic design and code reuse.b. Struct cannot be inherited in C++.
c. C++ supports multiple inheritance. d. Inheritance is a mechanism through which a subclass inherits the properties and behavior of its superclass.abhimanipal
- Feb 21st, 2010
The above answers are wrong. structs can be inherited in C++ . The only point to note is that for structs the defualt mode of inheritance for structs is public but for classes its private
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What are the things contains in .obj file ? ( compiled result of .cpp file )
smart_coder
- Jan 25th, 2007
Object file is the representation of code that a compiler generates by processing a source code file. Object files contain compact code, often called "binaries". A linker is used to generate an execut...
divya
- Dec 22nd, 2006
I guess it contain stsrtup code assembly instruction which used by compiler to compile the code
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What are Virtual Functions? How to implement virtual functions in "C"
kamranahmad
- May 26th, 2008
Hi here i have more simplified example Hope this will give you clear view and check this linkhttp://www.codersource.net/published/view/325/virtual_functions_in.aspx#include <stdio.h>#include <...
SomGollakota
- Apr 21st, 2008
Sukesh, Your response is essentially correct if we are talking about pure virtual functions. However, when we talk about virtual functions, then we perhaps need to make a distinction between regu...
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What is the difference between user defined object and Standard object?
Oleg Alexandrov
- Jun 25th, 2011
The difference pointed by the previous poster is very superficial. A "standard" object may have been defined by a "user", e.g., creator of a library.In C++ there is no discrimination against user-defi...
bornToLose
- Sep 22nd, 2007
Standard object is?that which is defined in header file which is develoved by C++ developer and contain in library of C++. It remain fix we cant make?different use. It is developed for specific purp...
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Classes
How many parameters are there in a binary operator implemented as a friend?Choose one answer. a. 2 b. 0 c. 1 d. as many as you need
Oleg Alexandrov
- Jun 25th, 2011
Since it is a friend, it is not a member. So the syntax has to be operator myOperator(s1, s2). So there are two arguments.
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Why size of an empty function is 5?
rahilchoudhary
- Sep 28th, 2010
There is no function to calculate the size of a function.And this 5 value of an empty function is a myth.Certain working programs can even have size of 4.Regards
ajrobb
- Sep 22nd, 2010
It isn't.#include <iostream>void f() {}int main() { std::cout << sizeof f() << 'n'; // fails to compile on g++ because return is void std::cout << sizeo...
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Why an empty Structure will occupy 2Bytes in C++
dkuy1
- Aug 9th, 2009
The Standard C++ language definition says: A class with an empty sequence of members and base class objects is an empty class. Complete objects and member sub-objects of an empty class type shall h...
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What are auto static variables and auto extern variables?
Biju Nair
- Jun 29th, 2006
A variable declared in one file can be used in another file by declaring it as extern in the second file.
mohit12379
- Apr 20th, 2006
Neither there is a concept of auto static var and Nor a auto extern varibales because auto var are local variable whose lifetime is within a block and located on stack area . Process w...
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How to write a program such that it will delete itself after execution?
tahoekid
- Jun 13th, 2011
The Richter method does delete the original file, but the temporary file remains behind.? I compiled this as-is, and on Windows Server 2003, and 64 bit Windows 7, the temp file is not deleted. Presum...
kumar
- Mar 18th, 2006
if the solution is needed for the unix platform. Then you can create a pthread at the bottom of the program, take the current process id of the parent and make it a deamon by using the standard unix c...
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Why does constructor doesn't have a return type ?
Yaron Jackoby
- Jun 10th, 2011
The constructor just return the object itself.when you call to new you get the object. the new calls to the constructor of the class in order to create the object and the return value from the new is the pointer of the object so this is the return value.
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What is the difference between c&c++?
pammi_11
- May 31st, 2008
c is a procedural language. where as c++ is object oriented programming language.
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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.
C++ Interview Questions
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