inheritence concept

bhanu prasannakumar

in inheritence concept overridden concept is there ,there i faced a problem i.e child class object is assigned to the parent class reference .so we r accessing the methods with same signature in parent class and child class those only we r accessing. but we r unable acess the other memberes of child class. actually my doubt is in memory point of view we r considered the what we r access the child class memberes by using parent class reference those r also same memory location why can't we r access the other methods of child class
for example

class A   //parent class
{
public void add() //method
{
statments;
}

class B:A //inheriting
{
public void add()   //assume overridden method we r access only these method only from parent class reference
{
statements;
}
public void sub() //unable to access the method through parent class reference why?add and sub methods r stored in same memory location but we r access only add method why not sub method
{
statements;
}
}

   please help me the answer for my question.

4 Replies

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Sam Hobbs16y ago
Can you please fix your spelling errors and other syntax errors in your message? Please don't do things such as say "r" instead of "are". I understand that English is not your primary language and I want to do the best I can to undersand you. I am not saying you have to use perfect English; I am just asking that you try to fix errors. I think you are not trying enough to fix errors in spelling and such.

I really, really don't understand "we r considered the what we r access the child class memberes".

I thik you are saying that you want to execute the sub function from an instance of the A class and instead of explaining why that won't work, the answer is that it just won't work; you cannot do that. You can make sub a virtual function in the A class and then you probably can do what you need to do.
0
Jaish Mathews16y ago
How do you identify they are in same memory area? If same memory area means only one methos really exists. All other methods just Ref. to that area even though they are not really exists. Here nto that case.
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bhanu prasannakumar16y ago
k,i agree with ur answer .but my doubt is we can see add and sub method are stored in same memory location but we r accessing the only add method why not sub.sub is also stored at same memory location na.
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Jaish Mathews16y ago
Hi,
Sub() can not access from parent. It's following below OOPS theory
Child classes may access parent members, but parent classes can not access child members.
In real world example, Teacher is base class and Maths teacher is sub class. Maths Teacher will get all behaviour of base class Teacher besides specialized in Maths. But it's meaningless to say base class Teacher will get all behaviour of a Maths Teacher.
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