@ muthuraj
see here display in derived is overriding display() in base and also has
purpose
class A
{
int a;
public :
void dispaly()
{
cout<<a;
}
};
class B:public A
{
int b;
public :
void display()
{
A::dispaly();
cout<<b;
}
};
On Sun, Jul 31, 2011 at 10:25 AM, muthu raj <muthura...@gmail.com> wrote:
> Function overriding gains significance only when functions are declared
> virtual. Otherwise Overriding does not serve any purpose. the main idea
> behind virtual functions and method overloading is to implement Dynamic
> Polymorphism i.e decide which version of function(base or derived) to be
> invoked during runtime.
>
> *Muthuraj R
> IV th Year , ISE
> PESIT , Bangalore*
>
>
>
> On Sun, Jul 31, 2011 at 10:22 AM, Sandeep Jain <sandeep6...@gmail.com>wrote:
>
>> @Pandharinath: Please consider the following e.g.
>> class A
>> {
>> public:
>> void func(){ /* A'simplementation */}
>> };
>>
>> class B:public A
>> {
>> public:
>> void func(){/* B's implementation*/ }
>> };
>>
>> What is B's func() doing?
>>
>>
>>
>>
>> Regards,
>> Sandeep Jain
>>
>>
>>
>>
>> On Sun, Jul 31, 2011 at 10:36 PM, pandharinath gorde <
>> pandharinath.go...@gmail.com> wrote:
>>
>>>
>>> sandeep ur misguiding all things are,.
>>>
>>> for overriding virtual keyword is used that means virtual functions only
>>> overriden.
>>> In c++ u require to add virtual keyword.
>>> and in java every non static function is by default virtual.
>>>
>>>
>>>
>>> On Sun, Jul 31, 2011 at 10:23 PM, Sandeep Jain <sandeep6...@gmail.com>wrote:
>>>
>>>> Overridden functions and virtual functions are two different concepts...
>>>>
>>>> 1) Two functions in the same scope having same but different signatures
>>>> = Over Loading
>>>> 2) Two functions having same signatures but one defined in parent class
>>>> and the other defined in child class == Overriding
>>>> 3) Virtual functions, allow for run time polymorphism among overridden
>>>> functions.(only when invoked using pointer)
>>>>
>>>> btw I'm still trying to think if preventing function over-riding is
>>>> possible...
>>>>
>>>>
>>>> Regards,
>>>> Sandeep Jain
>>>>
>>>>
>>>>
>>>>
>>>> On Sun, Jul 31, 2011 at 10:13 PM, Ankit Minglani <
>>>> ankit.mingl...@gmail.com> wrote:
>>>>
>>>>> @aditi : in C++ you define a function virtual to let the derived class
>>>>> give its own definition for the same. and in that case the functions are
>>>>> overridden. unlike in JAVA where no virtual keyword is needed .. so if you
>>>>> write the same code as above in java .. that may be referred to as Method
>>>>> overriding .. but not in cpp.
>>>>>
>>>>>
>>>>> On Sun, Jul 31, 2011 at 9:34 AM, aditi garg <aditi.garg.6...@gmail.com
>>>>> > wrote:
>>>>>
>>>>>> @ Ankit: Wat is overriding actually thn?
>>>>>>
>>>>>>
>>>>>> On Sun, Jul 31, 2011 at 9:58 PM, Anika Jain
>>>>>> <anika.jai...@gmail.com>wrote:
>>>>>>
>>>>>>> ohkk.. m so sorry
>>>>>>>
>>>>>>>
>>>>>>> On Sun, Jul 31, 2011 at 9:41 PM, Ankit Minglani <
>>>>>>> ankit.mingl...@gmail.com> wrote:
>>>>>>>
>>>>>>>> @anika: This is not function overriding i think .. you cannot call
>>>>>>>> the f() function of the base class from the derived class object ..
>>>>>>>> what you
>>>>>>>> are doing is creating a object of the derived class and calling the
>>>>>>>> version
>>>>>>>> of f() that belong to derived class B .. ie is the same class object is
>>>>>>>> calling the same class function .
>>>>>>>>
>>>>>>>> correct me if i m wrong .
>>>>>>>>
>>>>>>>>
>>>>>>>> On Sun, Jul 31, 2011 at 8:42 AM, Anika Jain <anika.jai...@gmail.com
>>>>>>>> > wrote:
>>>>>>>>
>>>>>>>>> @ muthu : not declaring tht function as virtual wont save
>>>>>>>>> overriding
>>>>>>>>>
>>>>>>>>> class A
>>>>>>>>> {
>>>>>>>>> int a;
>>>>>>>>>
>>>>>>>>> public:
>>>>>>>>> void f()
>>>>>>>>> {}
>>>>>>>>> int f2(){}
>>>>>>>>> };
>>>>>>>>>
>>>>>>>>> class B:public A
>>>>>>>>> {
>>>>>>>>> public:
>>>>>>>>> void f()
>>>>>>>>> {
>>>>>>>>> cout<<"abc\n";
>>>>>>>>> }
>>>>>>>>> };
>>>>>>>>>
>>>>>>>>> int main()
>>>>>>>>> {
>>>>>>>>> B ob;
>>>>>>>>> ob.f();
>>>>>>>>> return 0;
>>>>>>>>> }
>>>>>>>>>
>>>>>>>>> in this output is abc..
>>>>>>>>> so overriding occured
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> On Sun, Jul 31, 2011 at 8:41 PM, muthu raj
>>>>>>>>> <muthura...@gmail.com>wrote:
>>>>>>>>>
>>>>>>>>>> Using friend functions we can only invoke already defined private
>>>>>>>>>> functions. We cannot override or prevent overriding using friend
>>>>>>>>>> functions.
>>>>>>>>>> The problem here is how to prevent base class function from being
>>>>>>>>>> overridden
>>>>>>>>>> in derived class.
>>>>>>>>>>
>>>>>>>>>> *Muthuraj R
>>>>>>>>>> IV th Year , ISE
>>>>>>>>>> PESIT , Bangalore*
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> On Sun, Jul 31, 2011 at 8:04 AM, Anika Jain <
>>>>>>>>>> anika.jai...@gmail.com> wrote:
>>>>>>>>>>
>>>>>>>>>>> what if we write that function as private of base class.. and
>>>>>>>>>>> make a function in derived class that is friend function of the
>>>>>>>>>>> base class
>>>>>>>>>>> do that it can call tht private function of base.??
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> On Sun, Jul 31, 2011 at 8:25 PM, muthu raj <muthura...@gmail.com
>>>>>>>>>>> > wrote:
>>>>>>>>>>>
>>>>>>>>>>>> Yeah but there is no equivalent of final keyword in c++.....So
>>>>>>>>>>>> to prevent member function from overriding in derived class in c++
>>>>>>>>>>>> dont
>>>>>>>>>>>> declare the member function as virtual. Then it cannot be
>>>>>>>>>>>> overridden in
>>>>>>>>>>>> derived class. There is no other way of preventing a member
>>>>>>>>>>>> function of base
>>>>>>>>>>>> class from being overridden.
>>>>>>>>>>>>
>>>>>>>>>>>> *Muthuraj R
>>>>>>>>>>>> IV th Year , ISE
>>>>>>>>>>>> PESIT , Bangalore*
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>> On Sun, Jul 31, 2011 at 7:38 AM, himanshu kansal <
>>>>>>>>>>>> himanshukansal...@gmail.com> wrote:
>>>>>>>>>>>>
>>>>>>>>>>>>> i think there is no keyword known as final in c++.....maybe u
>>>>>>>>>>>>> are talking with respect to java....
>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>> On Sun, Jul 31, 2011 at 8:03 PM, muthu raj <
>>>>>>>>>>>>> muthura...@gmail.com> wrote:
>>>>>>>>>>>>>
>>>>>>>>>>>>>> By declaring the function a static final f().....
>>>>>>>>>>>>>> *Muthuraj R
>>>>>>>>>>>>>> IV th Year , ISE
>>>>>>>>>>>>>> PESIT , Bangalore*
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> On Sun, Jul 31, 2011 at 7:28 AM, himanshu kansal <
>>>>>>>>>>>>>> himanshukansal...@gmail.com> wrote:
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> sry i think....i misspelled d ques....
>>>>>>>>>>>>>>> d ques was....
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> how will you protect a derived class to override base class's
>>>>>>>>>>>>>>> member function in c++....
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> say if there is a function f() in base class then derived
>>>>>>>>>>>>>>> should not be able to
>>>>>>>>>>>>>>> override f() to provide its own definition.....
>>>>>>>>>>>>>>> but The function must be accessible in derived class.
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> PS:dont try to make the function private in base class( it
>>>>>>>>>>>>>>> will be
>>>>>>>>>>>>>>> become inaccessible in derived class).
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> On Sun, Jul 31, 2011 at 7:49 PM, himanshu kansal <
>>>>>>>>>>>>>>> himanshukansal...@gmail.com> wrote:
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> how will you protect a base class to override its member
>>>>>>>>>>>>>>>> function in
>>>>>>>>>>>>>>>> derived class....
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> say if there is a function f() in base class then derived
>>>>>>>>>>>>>>>> cannot
>>>>>>>>>>>>>>>> override f() to provide its own definition.....
>>>>>>>>>>>>>>>> The function must be accessible in derived class.
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> PS:dont try to make the function private in base class( it
>>>>>>>>>>>>>>>> will be
>>>>>>>>>>>>>>>> become inaccessible in derived class).
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> --
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> Regards
>>>>>>>>>>>>>>> Himanshu Kansal
>>>>>>>>>>>>>>> Msc Comp. sc.
>>>>>>>>>>>>>>> (University of Delhi)
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> --
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>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> --
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>>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>> --
>>>>>>>>>>>>>
>>>>>>>>>>>>> Regards
>>>>>>>>>>>>> Himanshu Kansal
>>>>>>>>>>>>> Msc Comp. sc.
>>>>>>>>>>>>> (University of Delhi)
>>>>>>>>>>>>>
>>>>>>>>>>>>> --
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>>>>>>>>>>>>>
>>>>>>>>>>>>
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>>>>>>>>>>>>
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>>>>>>>>>>
>>>>>>>>>> --
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>>>>>>>>>
>>>>>>>>> --
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>>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> --
>>>>>>>> The more you sweat in the field, the less you bleed in war."
>>>>>>>>
>>>>>>>> Ankit Minglani
>>>>>>>> NITK Surathkal
>>>>>>>>
>>>>>>>> --
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>>>>>>>>
>>>>>>>
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>>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> --
>>>>>> Aditi Garg
>>>>>> Undergraduate Student
>>>>>> Electronics & Communication Divison
>>>>>> NETAJI SUBHAS INSTITUTE OF TECHNOLOGY
>>>>>> Sector 3, Dwarka
>>>>>> New Delhi
>>>>>>
>>>>>>
>>>>>> --
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>>>>>>
>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> The more you sweat in the field, the less you bleed in war."
>>>>>
>>>>> Ankit Minglani
>>>>> NITK Surathkal
>>>>>
>>>>> --
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>>>>>
>>>>
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>>>>
>>>
>>>
>>>
>>> --
>>> Pandharinath Gorde
>>> +91-9620557641
>>>
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