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Overloading In C++

Creating two or more members that have the same name but are different in number or type of parameter is known as overloading.

Types Of Overloading

1.Function Overloading

2.Operator Overloading

Fig:Overloading In C++ 

1. Function Overloading

The process of having two or more functions with the same name, but different parameters, is known as function overloading.

The function is redefined by either using different types of arguments or a different number of arguments. It is only through these differences that a compiler can differentiate between functions.

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.Operator overloading

Operator overloading is a compile-time polymorphism in which the operator is overloaded to provide special meaning to the user-defined data type. Operator overloading is used to overload or redefine most of the operators available in C++. It is used to perform the operation on the user-defined data type.

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