Compile Time Polymorphism In C++ | Compile Time Polymorphism In C++ Example | Compile Time Polymorphism In C++ In Hindi

 

Compile Time Polymorphism In C++

This type of polymorphism is achieved by function overloading or operator overloading.

       ·    Function Overloading  

       ·  Operator Overloading

 

Fig:Compile Time Polymorphism In C++

     1.   Function Overloading

 When there are multiple functions with same name but different parameters then these functions are said to be overloaded. Functions can be overloaded by change in number of arguments or/and change in type of arguments.

Synatx:

return type functionname(datatype variablename)

{

 

}

return type functionname(datatype variablename, variablename)

{

 

}

return type functionname(datatype variablename,datatype variablename)

{

 

}

Program:

#include<iostream.h>

#include<conio.h>

class BCA

{

int a,b;

public:

void input()

{

cout<<”input one number”;

cin>>a;

}

void input(int x)

{

b=x;

}

void show()

cout<<”a=”<<a;

cout<<”b=”<<b;

}

};

void main()

{

BCA p;

p.input();

p.input(20);

p.show();

getch();

}

Output:

Input one number 1

a=1 b=20

     2.Operating System:

C++ also provide option to overload operators. For example, we can make the operator (‘+’) for string class to concatenate two strings. We know that this is the addition operator whose task is to add two operands. 

Syntax:

class classname

{

-----------

----------

Public:

return type operator++(argument)

{

---------

----------

}

returntype operator operatorname(argument)

{

-----------

-----------

}

};

Program:

#include<iostream.h>

#include<conio.h>

class BCA

{

int n;

public:

BCA()

{

n=0;

void operator++()

{

n=n-2;

}

void operator—()

{

n=n+2;

}

void show()

{

cout<<”n=”<<n;

}

};

void main()

{

BCA a1;

a1.show();

++a1;

a1.show();

++a1;

a1.show();

--a1;

a1.show();

--a1;

a1.show();

getch();

}

Output:

n=0 n=-2 n=-4 n=-2 n=0