Asus Frequently Asked C++ Interview Questions Answers

What Are Proxy Objects In C++?

Objects that stand for other objects are called proxy objects or surrogates.

template <class t=""> class Array2D
{
public
class Array ID
{
public
T&operator[](int index);
const T&operator[](int index)const;
};
Array ID operator[] (int index);
const Array ID operator[] (int index) const;
};
The following then becomes legal

Array2D<float>data(l0,20); cout«data[3][6]; // fine
Here data[3] yields an ArraylD object and the operator [] invocation on that object yields the float in position(3,6) of the original two dimensional array. Clients of the Array 2D class need not be aware of the presence of the ArraylD class. Objects of this latter class stand for one-dimensional array objects that, conceptually, do not exist for clients of Array2D. Such clients program as if they were using real, live, two-dimensional arrays. Each ArraylD object stands for a one-dimensional array that is absent from a conceptual model used by the clients of Array2D. In the above example, ArraylD is a proxy class. Its instances stand for one-dimensional arrays that, conceptually, do not exist.

Name Some Pure Object Oriented Languages?

pure object oriented languages are Smalltalk, Java, Eiffel, Sather.

What Is A Node Class In C++?

A node class is a class that,

relies on the base class for services and implementation.
provides a wider interface to the users than its base class.
relies primarily on virtual functions in its public interface.
depends on all its direct and indirect base class.
can be understood only in the context of the base class.
can be used as base for further derivation.
can be used to create objects.
A node class is a class that has added new services or functionality beyond the services inherited from its base class.

Asus Most Frequently Asked C++ Interview Questions Answers

What Is An Orthogonal Base Class In C++?

If two base classes have no overlapping methods or data they are said to be independent of, or orthogonal to each other. Orthogonal in the sense means that two classes operate in different dimensions and do not interfere with each other in any way. The same derived class may inherit such classes with no difficulty.

What Is A Container Class? What Are The Types Of Container Classes In C++?

A container class is a class that is used to hold objects in memory or external storage. A container class acts as a generic holder. A container class has a predefined behavior and a well-known interface. A container class is a supporting class whose purpose is to hide the topology used for maintaining the list of objects in memory. When a container class contains a group of mixed objects, the container is called a heterogeneous container; when the container is holding a group of objects that are all the same, the container is called a homogeneous container.

How Do You Write A Function That Can Reverse A Linked-list In C++?

void reverselist(void)
{  if(head==0)
return;
if(head-<next==0)
return;
if(head-<next==tail)
{
head-<next = 0;
tail-<next =  head;
}  else
{
node* pre = head;
node* cur = head-<next;
node* curnext = cur-<next; head-<next =  0; cur-<next = head;
for(; curnext !=0;)
{
cur-<next = pre;
pre = cur;
cur = curnext;
curnext = curnext-<next;
}
curnext-<next = cur;
}
}

What Is Polymorphism In C++?

Polymorphism in C++ is the idea that a base class can be inherited by several classes. A base class pointer can point to its child class and a base class array can store different child class objects.

How Do You Find Out If A Linked-list Has An End? (i.e. The List Is Not A Cycle)

You can find out by using 2 pointers. One of them goes 2 nodes each time. The second one goes at 1 nodes each time. If there is a cycle, the one that goes 2 nodes each time will eventually meet the one that goes slower. If that is the case, then you will know the linked-list is a cycle.

How Can You Tell What Shell You Are Running On Unix System?

You can do the Echo $RANDOM. It will return a undefined variable if you are from the C-Shell, just a return prompt if you are from the Bourne shell, and a 5 digit random numbers if you are from the Korn shell. You could also do a ps -1 and look for the shell with the highest P(K).

What Is Boyce Codd Normal Form?

A relation schema R is in BCNF with respect to a set F of functional dependencies if for all functional dependencies in F+ of the form a->b, where a and b is a subset of R, at least one of the following holds

a->b is a trivial functional dependency (b is a subset of a).
a is a superkey for schema R.

What Is Pure Virtual Function?

A class is made abstract by declaring one or more of its virtual functions to be pure. A pure virtual function is one with an initializer of = 0 in its declaration.

Write A Struct Time Where Integer M, H, S Are Its Members

struct Time
{
int m;
int h;
int s;
};

How Do You Traverse A Btree In Backward In-order?

Process the node in the right subtree.
Process the root.
Process the node in the left subtree.

What Is The Two Main Roles Of Operating System?

As a resource manager.
As a virtual machine.