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


 

 
 STL interview questions  STL Interview Questions (91)
 OOPS interview questions  OOPS Interview Questions (558)
 C++ General interview questions  C++ General Interview Questions (458)
Question
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  
 
Answer
# 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 ?    66 Yes 4 No
A.srinivas Rao
 
Answer
# 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
existance.

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,
right?
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
Zubeir
 
 
 
Answer
# 3
An abstract class is the class that define the interface
without the necessity to implement all the member
functions.

The derived class (from base abstract class) that implement
all the missing functions
 
Is This Answer Correct ?    37 Yes 10 No
Hkouki
 
Answer
# 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
methods.
 
Is This Answer Correct ?    11 Yes 3 No
Siva Rama Krishna
 
Answer
# 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
 
Answer
# 6
An abstract class is the class that define the interface
without the necessity to implement all the member
functions.

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

 
 
 
Other STL Interview Questions
 
  Question Asked @ Answers
 
what's the difference between function overloading and function overiding?   5
what's the difference between abstract class and concreate class? what's the meaning of standard template library(STL)?   6
#define CUBE(x) (x*x*x) main() { int a,b=3; a=cube(b++); printf("%d %d",a,b); } What should be the value of a and b? My calc a=4 but syst a=6 how pls tell me if you know it? Wipro 11
what is compiler?   4
what is electronic software   1
Describe the elements of Microsoft Word screen. Write down steps for creating, saving, retrieving, editing and printing a document.   1
method overloading means what? CTS 2
what is an algorithm in terms of STL? Wipro 1
In what cases using of a 'template' is a better approach then using of a 'base class'? Lucent 6
Write a program in C/C++ to implement reader- writer problem Wipro 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
What is the underlying datastructure of map? Siemens 5
 
For more STL Interview Questions Click Here 
 
 
 
 
 


   
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