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What is the difference between pass by reference and pass by
value?
- 12 Answers
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Answer / anandan
in pass by referance the parameters are passed as the
address of the variables whereas in pass by value the
variables are directly passed as parameters
| Is This Answer Correct ? | 99 Yes | 17 No |
Answer / subha raman
In case of pass by value..the change in the sub-function
will not cause any change in the main function wheareas in
pass by reference..the change in the sub-function will
change the value in the main function..
| Is This Answer Correct ? | 57 Yes | 9 No |
Answer / manila
Pass By Value:
1.It passes the actual value of parameter from the function
call.
2.Value of the parameter variable in calling functions
remains unchanged.
3.copy of the variable of actual parameter are made and
transfer to the formal parameter.
call By Reference:
1.the address of the actual parameter has to be transfered
2.the formal parameter in the function decleretion must of
pointer type.
3.Any changes in the formal parameter can change the value
of actual patameter.
| Is This Answer Correct ? | 30 Yes | 11 No |
in Pass by value; if any change in variable in the sub-
function may not reflected to the main function. where as
in pass by reference the change in the variable may reflect
to the original value in the main funtion.
ex : // Pass by Reference
void Get( int &nIndex){
nIndex = 10;
}
void main()
{
int x = 100;
cout<<Get( x );
}
o/p : 10;
ex : // Pass by Value
void Get( int nIndex){
nIndex = 10;
}
void main()
{
int x = 999;
cout<<Get( x );
}
o/p : 999
| Is This Answer Correct ? | 29 Yes | 17 No |
Answer / ganesh
in pass by referce function can access original memory
location of variable so can access value while in case of
pass by value fuction can copy the value of variable to the
prototype of its kind of variable so calling funcion can
access the prototype variable but not the direct original
variable.
| Is This Answer Correct ? | 16 Yes | 9 No |
Answer / sravanthi
pass by reference is nothing but a value is called by using
its reference value i.e., its address value where as pass by
value is that which is called by its value initialized.
| Is This Answer Correct ? | 10 Yes | 3 No |
Answer / anwer sayed
Pass By Reference :
In Pass by reference address of the variable is passed to a
function. Whatever changes made to the formal parameter will
affect to the actual parameters
- Same memory location is used for both variables.(Formal
and Actual)-
- it is useful when you required to return more then 1 values
Pass By Value:
- In this method value of the variable is passed. Changes
made to formal will not affect the actual parameters.
- Different memory locations will be created for both variables.
Read more:
http://wiki.answers.com/Q/What_is_the_difference_between_pass_by_value_and_pass_by_reference_in_c#ixzz16MOpWSLk
| Is This Answer Correct ? | 3 Yes | 0 No |
Answer / john otieno onyango
passby value a copy of the entire object is passed to the
function
While
pass by reference only the address of the object is
transferred to the function
| Is This Answer Correct ? | 2 Yes | 0 No |
Answer / giridhar varma
hello!all the above answers are correct!
| Is This Answer Correct ? | 18 Yes | 17 No |
Answer / prakash
give me the sample code of pass by reference and pass by
value in c++ !!!!!!!1
| Is This Answer Correct ? | 5 Yes | 5 No |
what is the abstract class,interface ,its difference with a programatic eg.? hi,recently i went for an interview they ask me what is abstract class ,interface and its difference I said abstract class contain abstact method ,abstract method is a method with no body.Abstract class cannot be instantiated.Abstract class is a base class it required derived class for the implementation of method. Interface is a syntactical contract that all derived class should follow it define properties ,method,events which are known as member of interface. Then They asked me what is the difference between them. I said abstract class interface 1.abstact class can implement method 1.interface cant 2.abstact class can contain constructor, 2.interface cant destructor 3.abstract class cannot support multiple 3.interface support inheritance etc Then they said some different answer I said dont no. Then they ask me when i should make abstract class for an project and when i should make interface. I said if suppose there is two class which must be having method with different logic then we sholud make abstract class. and if suppose we have two class having method .with different logic then we can make interface . Am i correct with my explaination.if not correct me .please provide me that when should we create abstract class and interface and what is difference .please help me
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