-
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...
-
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...
-
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;}
-
Static and friend function in a class
Use of static and friend function in a class
Navnit kumar
- Sep 16th, 2014
What is difference between friend function and static function?
ajrobb
- Sep 22nd, 2010
A static function is associated with the class and not an object. It has access to other static functions and variables in the class and it is a friend.A friend function is declared in a class but doe...
-
Will the program run successfully?
Main(){ int a=2.9; float b=9; cin>>"%d %f">>a>>b; return();}
joanne.perater
- Feb 7th, 2010
This will generate compiler errors and a warning.A warning in lineint a = 2.9; //should use a typecast to convert to intand a compiler error in linecin >> "%d %f" >> a >> b; // cin does not take a right hand operand of const char
joanne.perater
- Feb 7th, 2010
This will generate compiler errors and a warning.A warning on lineint a = 2.9; // should use a typecast to convert to intand a compiler error on linecin>>"%d%f" >> a >> b; //cin does not take a right hand operand of const char
-
Explain Legal Function Naming with sample code
burraganesh
- Dec 7th, 2008
$_foo()$ symbol is used by compiler in a process called "name mangling",where each functions name and signature are preceded by $.Thus $ is a valid symbol that a compiler can understand.
-
Using Inheritance
Using inheritance, which of the following is not alloweda) Changing implementation of operation in parent by the subclassb) Using implementation of operation in parent class by the subclassc) Using attributes in parent class by the subclassd) Having operations is subclass which do not exist in parent classe) None
ajrobb
- Sep 22nd, 2010
EUsing inheritance, which of the following is not alloweda) Changing implementation of operation in parent by the subclassIf the parent defines a virtual method, the subclass can provide its own imple...
vijay.badola
- Oct 4th, 2009
We can override the implementation of parent class but we cannot change implementation from child class. So 'A' is not correct.
-
Do Nothing Constructor
What are Default Constructor and Do Nothing Constructor
yzesong
- Jul 30th, 2009
I think Do nothing constructor is the one OS offered, which has no argument in it, of course no return type. The default constructor has the same signature as DO nothing constructor, but you can write...
inspirevinchi
- May 16th, 2009
Constructor with no arguments or arguments with default value are called default constructor.
-
Deallocation of memory
When we allocates the memory using malloc() and calloc(), it returns pointer pointing to the base address to the allocated memory. But while freeing the memory we call free(pointer) thenHow the operation system knows that how much memory is about to be free.
amarnathsatrawala
- Jun 16th, 2009
Dynamic memory is allocated on heap. De-allocation is counterpart of the allocation operation. the task of allocation and De-allocation is handled by the base/standard libraries. These store infor...
tewari2312
- Jun 13th, 2009
Should have used the term compiler rather than OS, when we use these functions a pointer is formed pointing to the location of the base address of the allocated memory and when the value is assigned a...
-
Empty Class Size
What is the size of an empty class?
deep
- Oct 13th, 2011
What is the output for the below example?
Code- #include iostream
cpfeed
- Oct 29th, 2009
Class A{}most of time sizeof(A) = 1, however, it is a small integer regarding to the complier.
-
Matrix Operation using Operator Overloading
Write a program for four atrithmetic operations in matrix using operator overloading.
Nested Classes
Do Nested Clases exists? If so, where are they used?
coolba
- Mar 8th, 2010
Many of us had heard about inner class. That means class inside a class which is nothing but nesting of classes. Where You can use the members, functions of outer class but the vice versa is not true.
pavan khubani
- Feb 13th, 2010
Yes,For e.g., in class Employee, we can have class Name as member class.
Virtual Constructor
Why constructor cannot be virtual in C++?
C++ Type Conversion
Why does 'float' accept 'int' but not 'char'?
Classes
The copy constructor of class Money is called in which of the following cases?Choose one answer. a. Money amount1;Money amount2(amount 1); b. void func(Money amount);[...]Money amount1;[...]func(amount1); c. Money func();[...]Money amount1 = func(); d. all of the above
jaroo
- Oct 2nd, 2011
The correct answwer is:
"D. all of the above"
Memory Allocation
When is memory allocated for a function of a class? Is it when the program is complied, or only when the function is called?
wlochaty
- Jan 19th, 2011
Memory will be alocated during compilation but when there is no objects of the class than no memory may be allocated. Compiler may (not must) do some optimalizations when there is no instances of the class (no funcion call).
What is the Size of an Empty Class
What is the logic behind size of an empty class = 1? (As per C++)Ex:class base {};main(){printf("Size of the Empty Class is: %dn", sizeof(base));}It gives output: Size of the Empty Class is: 1I have not got the reason / logic behind this.Can anyone help me?
nilesh2080
- Mar 11th, 2011
The size of the empty class is i byte because empty class will provide the default constructor, default destructor, default copy constructor and default assigment operator. These function are called by the address of the pointer to functions, so the size of these address is 1 byte.
amitmanish
- Mar 4th, 2011
The size of an empty class's object is 1. The reason for this is that suppose if we have the size as 0, then two objects created one after the other would point to the same address. Having the siz...
Constructor initialization lists
What is advantage of using Constructor initialization lists?
Paul_Singh
- Feb 7th, 2012
For some object the initialized list is necessary because they are const or do not have default constructors. However, the main advantage is that if you construct the object in the constructor body th...
abc
- Feb 5th, 2012
--> initializer list is used with constructor when any const datas are used in a class. --> bcoz, as we known const var should be initialized while declaring. --> the class gets memory allocatio...
Ans