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What is the use of virtual destructor?
mehulgala177
- Sep 22nd, 2011
You should always keep your destructors virtual when u r dealing with Inheritance. Try this Code :
Code- #include <iostream>
- #include <tchar.h>
- " Destroying Parent
- "" Destroying Child
- "Also try the same code without using virtual keyword before ~Parent() u will see the difference... :)
rimsha
- Jul 27th, 2011
Virtual destructor is used to delete the dynamically allocated memory via a base class ptr.
The following code results in class eg { void ml( ) {int i = 6; for {int i=5: i< 10;i ++ } { if{i==6} continue; system.out.println {i} ; } } ; } 1. syntax / compilation error 2. 5 6 7 8 9 3. 6 7 8 9 4. 5 7 8 9
talktome.ruchi
- Sep 23rd, 2011
The correct answer is option 4, since the scope of both the i's are different so we can declare it multiple times
anabarai
- Jul 4th, 2011
If you see the for for block:
for {int i=5: i< 10;i ++ }
you will see that it has a semi colon after the int i=5 which results in a syntax error. so the answer would be 1. syntax/compilation error1.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.
What is the relation between class and object in c++ ?
surendrap
- Oct 4th, 2011
Simple class is template.no memory is allocated to class until object is declared of that class.
kaviraj
- Sep 30th, 2011
Class is a collection of objects shared a common name ,an object is a runtime entity of a class,using the object we can access class members and functions easily.
">What is the output of printf ("%d")
rahulsahu2455
- Oct 7th, 2011
It will take top element of stack which use for allocate memory for variables, so it ll print the value of last declared variable
shibshankar
- Sep 6th, 2011
It will print 0.
Constructors Programmatic
How do you pass parameters to super class ?
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.
What is a scope resolution operator?
A scope resolution operator (::), can be used to define the member functions of a class outside the class.
keloth1987
- Nov 7th, 2011
You can tell the compiler to use the global identifier rather than the local identifier by prefixing the identifier with ::, the scope resolution operator. :: identifier class-name :: identifier name...
rajendra chaudhary
- Nov 1st, 2011
It is an operator :: used mainly in class for defining the member functions and also for accessing the global variables.
and it is a eye of c++.Pointers Datatype
What is the datatype of pointer?
jbode
- Nov 19th, 2011
There is no single "pointer" data type; you have many pointer data types. A pointer to int may have a different size and representation from a pointer to char, which may have a different size and rep...
niharricky27
- Oct 10th, 2010
Pointer datatypes are actually the datatype of the variables whose address the pointer is going to store or point to.i.e. to point an integer value, the pointer should of the same datatype i.e. int type.
Which of the following operators can not be overloaded
A) == b)++ c)?! d)
ProgrmmingBOT
- Nov 21st, 2011
?:(ternary operator) , .(dot operator), :: (scope resolution operator), sizeof operator and conditional operators.
maddy
- Nov 19th, 2011
++ ?!
Adding user from c program to Mysql.
Write a C/C++ program to add a user to MySQL. The user should be permitted to only "INSERT" into the given database.
What is the use of delete operator in c++?
Amit
- Jan 6th, 2012
Delete: is used to deallocate memory from the heap that is created by new.
When you call delete, it firstly call the destructor of that object and then deallocate memory from heap.
class A
{
};
int
main()
{
A *a = new A();
delete a;
A *arr = new A[10];
delete []arr;
}Inline functions advantages
What is the inline function and what is the use of inline function?
Paul_Singh
- Feb 7th, 2012
The inline keyword is a request to the compiler that you want the function body to be inserted into the compiled code as opposed to a function call. Typically used for functions that are called very o...
Amit
- Jan 6th, 2012
Inline function: they are same as Normal function but compiler treat them diffrently. When we call a inline function compiler will replace the call by inline function body (It depends upon how you hav...
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...
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"
What are the different way of creating object in c++ ?
NikunjSingh
- Feb 23rd, 2012
1. using normal object creation: Shape obj; 2. copy ctor: Shape obj2=obj;// or Shape obj3(obj); 3. using new operator;
Code- #include <iostream>
- "Shape...""Copy called""new....""allocation fail : no free memory"
Isaac
- Feb 21st, 2012
1. Create on stack. i.e. ClassA varA;
2. Create on heap. i.e. ClassA *ptrA = new ClassA;
Ans