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Categories >> Software >> Programming Languages >> C++ >> STL


 STL interview questions  STL Interview Questions (93)
 OOPS interview questions  OOPS Interview Questions (563)
 C++ General interview questions  C++ General Interview Questions (459)
what's the difference between abstract class and concreate
class? what's the meaning of standard template library(STL)?
 Question Submitted By :: STL
I also faced this Question!!     Answer Posted By  
# 1
An abstract class is a class which contains atleast one
abstract method(i.e., an abstract method is one which has
only definition not implementation,which is done in some
other class.
We cannot create an object for Abstract class.
A class is said to be a concrete class if and only if it
contains fully defined methods.Defined methods are also
known has "concrete methods " or "Implemented methods".
We can instantiate an object for concrete class.
Is This Answer Correct ?    68 Yes 4 No
A.srinivas Rao
# 2
First of all, we should understand what is the meaning
of 'abstract' in terms of software. It's the same meaning
as in English, that is, the entities (objects) which do not
exist in the real world are abstract entities. For example,
Dog, Cat, Bear, Deer are all animals that exist but animal
is also an entity which is just a concept and there is no

So we can define an abstract class for 'Animal'. We can
derive any number of real world animal classes from the
abstract class 'Animal' like Tiger, Lion, Donkey, etc.

Obviously, we can understand now why we cannot create
objects for abstract classes. The answer is we must not,
Because the Animal class has no existance in real world. So
we cannot create a real world entity (nothing but an
object). That is the very reason this concept is followed.
The derived classes that we've seen above are concrete
classes since they are real world objects and have definite
properties and operations on them.
Is This Answer Correct ?    39 Yes 6 No
# 3
An abstract class is the class that define the interface
without the necessity to implement all the member

The derived class (from base abstract class) that implement
all the missing functions
Is This Answer Correct ?    37 Yes 10 No
# 4
the abstract method we can't create object,only create from
derived classes only that means which sub class have no
abstract method.then by using that object only call the
Is This Answer Correct ?    11 Yes 3 No
Siva Rama Krishna
# 5
An Abstract class is cannot be instantiated.means cannot
make object of this class.It has contains one or more
methods ..but it no implement..

interfaces are same as abstract classes only difference is we
an only define method definition and no implementation.
Is This Answer Correct ?    4 Yes 1 No
Jijo O R
# 6
An abstract class is the class that define the interface
without the necessity to implement all the member

The derived class (from base abstract class) that implement
all the missing functions
Is This Answer Correct ?    5 Yes 5 No

Other STL Interview Questions
  Question Asked @ Answers
what are you now programming Languages C+ HCL 1
why & sign is used in copy constructor   4
Assume I have a linked list contains all of the alphabets from "A" to "Z?" I want to find the letter "Q" in the list, how does you perform the search to find the "Q?"   2
Explain when u will use Observer pattern and how u will implement in c++ .   1
Define the terms: field, record, table and database   4
write a c++ program to create an object of a class called employee containing the employee code name designation basic salarry HRA Da gross salary as data 10 such objects "members process "   1
wap in c++ which accept a integer array and its size as argument and replaces element having even values with its half and element having odd values with twice its value   1
write a piece of c++ code which allocate memory to the 50 object of type CObj   2
what is compiler?   4
what is the difference between thread and process Infosys 1
5. Write c++ function that would intake a string and return the number of occurrences of a given character in that sring Ex:- if the word is “Colombo” and count the occurrences of the letter “o” the function would return 3   1
For more STL Interview Questions Click Here 

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