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Object
Object
Oriented Programming
Oriented Programming
(OOP)
(OOP)
Lecture No. 25
Lecture No. 25
Overriding
Overriding
Parent
Func
Child
Func
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Overriding Member Functions of
Overriding Member Functions of
Base Class
Base Class
Derive class can override member function
Derive class can override member function
of base class such that the working of
of base class such that the working of
function is totally changed function is totally changed
Overriding Member Functions of
Overriding Member Functions of
Base Class
Base Class
Derive class can override member function
Derive class can override member function
of base class such that the working of
of base class such that the working of
function
function is similar
is similar to former implementation
to former implementation
OutputOutput
Output:
Output:
Name: Ahmed
Name: Ahmed
Major: Computer Science
Major: Computer Science
Example
Example
class Student : public Person{
class Student : public Person{
char * major;
char * major;
public:
public:
Student(char * aName, char* m);
Student(char * aName, char* m);
void Print(){
void Print(){
Print();//Print of Person
Print();//Print of Person
cout<<
cout<< “
Major:
Major: ”
<< major <<endl;
<< major <<endl;
ExampleExample
int main(){
int main(){
Student a(
Student a(
Ahmad
Ahmad
Computer
Computer
Science
Science
a.Print(); a.Print();
return 0;
return 0;
Overriding Member Functions of
Overriding Member Functions of
Base Class
Base Class
The pointer must be used with care when
The pointer must be used with care when
working with overridden member
working with overridden member
functions
functions
Hierarchy of Inheritance
Hierarchy of Inheritance
We represent the classes involved in
We represent the classes involved in
inheritance relation in tree like hierarchy
inheritance relation in tree like hierarchy
Direct Base Class
Direct Base Class
A direct base class is explicitly listed in a derived
A direct base class is explicitly listed in a derived
class's class's header with a colon (:)header with a colon (:)
class Child1:public Parent1class Child1:public Parent
