Operator Overloading

Operator Overloading

·         Operator overloading means we are extending the value of an operator.

·         So that it can be used for user defined functions.

·         Operator overloading is the ability to tell the compiler how to perform a certain operation when its corresponding operator is used on one or more variables.

·         It means the behavior of operators when applied to objects of a class can be redefined. It is similar to overloading functions except the function name is replaced by the keyword operator followed by the operator’s symbol. There are 5 operators that are forbidden to overload. They are :: . .* sizeof ?:

Syntax:

<return> <type operator> op();

Example:

int operator –();

·         The keyword operator tell the compiler that “-” operator is overloaded.

·        

Operator overloading means,      meaning of an operator is not     changed but value of this      operator is extended.

To invoke this operator we use following operator.

    -o1;

For Example:

#include<iostream.h>

#include<conio.h>

Class overload

{

int ab,ac;

public:

overload()

{

ab=-123;

ac=222;

}

void operator –()      //operator is overload here

{

Ab=-ab;

ac=-ac;

}

void show()

{

cout<<ab;

cout<<ac;

}

};

void main()

Output: Ab=123 Ac=-222

{

Overload ol;

-ol;

ol.show();

getch();

}