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Categories >> Software >> Programming Languages >> C++ >> OOPS
 
 


 

 
 STL interview questions  STL Interview Questions (93)
 OOPS interview questions  OOPS Interview Questions (563)
 C++ General interview questions  C++ General Interview Questions (459)
Question
What is the difference between declaration and definition?
 Question Submitted By :: OOPS
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
During declaration we just specify the type and no memory
is allocated to the variable. But during the definition an
initial value is assigned and memory is allocated to the
variable.
 
Is This Answer Correct ?    179 Yes 31 No
Roshan
 
Answer
# 2
Declaration means we are just creating a variable or method.
Defination means we are assigning some value for a variable
& doing some functions in method
 
Is This Answer Correct ?    111 Yes 46 No
S
 
 
 
Answer
# 3
The definition is the one that actually allocates space,
and provides an initialization value, if any.
There can be many declarations, but there must be exactly
one definition. A definition tells the compiler to set
aside storage for the variable. A declaration makes the
variable known to parts of the program that may wish to use
it. A variable might be defined and declared in the same
statement
 
Is This Answer Correct ?    53 Yes 3 No
Sanjay
 
Answer
# 4
Ans: The declaration is means the memory is not yet all to
be allocated..
For example:
Int a; //is it declaration? Or definition?
Just check this
Int main()
{
Int I;
Printf(%d,i);
}
It prints the garbage value that means the memory is
allocated for this declaration so we can say that this int I
is both declaration and definition.
And take another example extern int I -- declaration
because no memory is allocated.
Similarly for function prototypes all are declarations.
In the case of class declaration String s; // Declaration
[because reference is created]
When the new keyweord encounters then it is definition
String *s=new Stirng(); //declaration and
definition
 
Is This Answer Correct ?    36 Yes 2 No
Rajesh Manem
 
Answer
# 5
Declaration means just telling to complier about variable
or function but definition means actually allocating memory
for variable.
 
Is This Answer Correct ?    24 Yes 3 No
Omkar
 
Answer
# 6
Declaration Mean You just Declare a variable and Function
their is No Allocation of Memory.But In Defination Actual
use of use declare Variable and Function Assing the value
with accupy Memory as Per their Type.
 
Is This Answer Correct ?    10 Yes 6 No
Sachin Bhosale
 
Answer
# 7
Declaration means it exits but it has no meaning. But where
as definition means it has a meaning. Without decalration
there is no definition. Why means without existing how can
we use.
Some situations we do both in a single statement like,
int i = 10;
here i is declared and definie with the value 10;
But some languages give some value to the variable without
defining like
class DiffsDemo {
int i;
}

DiffsDemo demo = new DiffsDemo();
print: demo.i;
output: 0;

This will happen because some default values are assigned
to that types. Internally at run time they will define.
 
Is This Answer Correct ?    8 Yes 4 No
Krishna Chowdary Garapati
 
Answer
# 8
The declaration tells the compiler that at some later point
we plan to present the definition of this declaration.
E.g.: void stars () //function declaration
The definition contains the actual implementation.
E.g.: void stars () // declarator
{
for(int j=10; j > =0; j--) //function body
cout << *;
cout << endl; }
 
Is This Answer Correct ?    4 Yes 0 No
Friend Nitk
 
Answer
# 9
Declaration of a function is COMPILATION PHASE,inorder to
support the SIGNATURE OF FUNCTION like function
name,arguments. Simply it identifies FUNCTION.

Where as in defination, function cotains SET OF
STATEMENTS and expands SOURCE CODE in the form of
instructions
(all this is concept of functions)
 
Is This Answer Correct ?    3 Yes 0 No
Ganesh9948302505
 
Answer
# 10
During declaration we just specify the type and no memory
is allocated to the variable. But during the definition an
initial value is assigned and memory is allocated to the
variable.

or we can also say,

Declaration means just telling to complier about variable
or function but definition means actually allocating memory
for variable.
 
Is This Answer Correct ?    1 Yes 0 No
Soumyajit
 

 
 
 
Other OOPS Interview Questions
 
  Question Asked @ Answers
 
What is the difference between declaration and definition?   19
What is a scope operator and tell me its functionality? emc2 3
Write an operator overloading program to write S3+=S2.   2
how to find no of instances of an object in .NET? Infosys 1
Polymorphism with an example? emc2 8
how to create thread in java? Infosys 16
Which is faster post increment or pre increment ? and in which cases should u use either - to increase speed? EA-Electronic-Arts 4
In what situation factory design patterns,DAO design patterns,singleton design patterns should be applied.?   2
What is the outcome of the line of code "cout<<abs(- 16.5);"? 1) 16 2) 17 3) 16.5 TCS 16
What is Virtual Keyword? IBM 9
When is a memory allocated to a class?   11
Why do we use virtual functions?   4
 
For more OOPS Interview Questions Click Here 
 
 
 
 
 


   
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