polymorphism

1. G.KARTHIGA
M.SC(INFO TECH)
DEPARTMENT OF CS & IT
NADAR SARSWATHI COLLEGE OF ARTS & SCIENCE ,
THENI.

2.  The concept of polymorphism is implemented using the
overloaded function and operator.
 The overloaded member function are selected for
invoking by matching arguments both type and number.
 It is called binding or static binding or static linking.
 Member function could be selected while the program
is run time is known as runtime polymorphism

3. polymorphism
Compile time
polymorphis
m
Runtime
polymorphis
m
Function
overloading
Operator
overloading
Virtual
function

4.  Pointer is one of the key aspects of C++ language
similar to that of C.
 Pointer is derived data type that refers to another data
variable by storing the variable memory address rather
than data.
 A pointer variable defines to get the value of a specific
data variable of defining actual data.

5. ……. ….. 100 …. 1024 ….
Memory address
1020 1024 1032
integer
pointer

6.  The declaration of a pointer variable following form:
Example:
int *ptr;
Initialize a pointer:
int *ptr, a;
ptr=&a;
Data _type *pointer –
variable;

7. To manipulate a pointer with the indirect
operator “*” is known as dereference
operator
*pointer _variable

8. C++ allows pointers to perform the following arithmetic
operation:
1) A pointer can be incremented (++) or decremented (--).
2) Any integer can be added to subtracted from a pointer.
3) One pointer can be subtracted from another.
Example:
Int *aptr;
Ptr=&a[0];

9. The array of pointer represents a collection of
address.
An array of pointer point to an array of data
items.
Example:
int *in array[10];

10. A[2]
A[1]
A[1]
A[3]
A[4]
1000
1004
1008
1012
1016
a
a

11. The usage of pointer with one dimensional
array element.
A string is one dimensional array of character.
Example:
char num[]=“one”;
const char *numptr=“one”;

12.  The concept of pointer to function acts as a base for
pointer to member.
 Its known as callback function.
 These function pointer to refer to a function.
Declaration :
Example:
int (* num_function(int x));
data _type (* function_name) ();

13. To access the class member.
To point to an object created by a class.
Define a pointer:
Item *it_ptr;

14. This is a pointer that point to the object for
which this function was called.
The pointer this acts as an implict argument to
all the member function.
Example:
Class ABC
{
int a;
…..
};

15. Pointer to object of a class are type –
compatible with pointer to object of a derived
class.
Pointer is object of derived class.
B *cptr; // pointer to class B type
variable
B b;// base object
D d;// derived object
Cptr=&b;// cptr points to object