CSIT Object Oriented Programming with C++(Operator Overloading)Part I

 In this post, I am going to teach you Basic Concept of OPERATOR OVERLOADING.

So, let's get started,

Firstly, What is overloading?

Here is the Answer : Overloading refers to the ability to use a single identifier to define multiple methods of a class that differ in their input and output parameters.

Now take a look at definition of Operator Overloading:

In C++ , Operator Overloading means giving additional meanings and schematics to Normal C++ operators so that we can use them with User Defined Data Types. 

Now look at the list of Operators that can't be Overloaded.

  • Class Member Access / Dot Operator (.)
  • Pointer to Member Operator (.*)
  • Scope Resolution Operator (::)
  • Size Of Operator ( sizeof() )
  • Conditional Operator (?:)
There are two ways to Overload Operators  in C++. They are;

  1. Using Member Function
  2. Using Friend Function
IMPORTANT : For Overloading Operators ,We have to use 'operator' function. 

Now lets have a look at syntax for overloading operators.

Syntax:

return_type operator op (arguments)
{
//code to be implemented
}

Here 'op' means operator sign that we are going to overload.
 
Note : If we are overloading Operator using Friend Function, we have to add 'friend' keyword in front.

The following operators can't be overloaded using friend function.
  • Assignment Operator (=)
  • Function Call Operator ( () )
  • Subscripting Operator ( [] )
  • Class member access / Arrow Operator( ->)

In next post, we will learn about Rules that should be followed while performing operator Overloading. So refer next  post for that topic.

If This post Helped you, Please leave a comment, and share with your Coder Friends.
Thank You.

Keep Learning, Keep Growing


T

Comments

Post a Comment

Popular posts from this blog

CSIT Object Oriented Programming with C++(Insertion and Extraction Operator Overloading ) Part VI

  I am assuming that, You have already studied previous parts of Operator Overloading Series. So i n this post, I am going to teach you  How to Overload Insertion and Extraction operator. Here, I will overload '<<' and '>>' operator to input and output  distance class data.  So, let's get started, #include<iostream> using namespace std; class Distance{ int feet,inch; public: Distance(){ feet=0;inch=0; } Distance(int f,int i){ feet=f;inch=i; } friend ostream &operator <<(ostream &output , const Distance &d) { output<<"Feet: "<<d.feet<<" Inch: "<<d.inch<<endl; return output; } friend istream &operator >>(istream &input, Distance& d) { input>>d.feet>>d.inch; return input; } }; int main() { Distance d1(4,8), d2; cin>>d2; cout<<d1<<endl; cout<<d2; return 0; } In this ...
Read more

CSIT Object Oriented Programming with C++(Unary Operator Overloading using Friend function) Part IV

  I am assuming that, You have already studied Part I,II and III of Operator Overloading Series. So i n this post, I am going to teach you How to perform Unary operator overloading using friend function. So, let's get started, //Overloading pre-increment operator using friend function #include<iostream> class A{ int length,breadth; public: A(int l, int b) { length=l; breadth=b; } friend void operator ++( A&); void display() { cout<<"Length: "<<length<<endl<<"Breadth: "<<breadth<<endl; } }; void operator ++( A& b); { ++b.length; ++b.breadth; } int main() { A a(7,14); ++a;     //equivalent to operator ++(a); a.display(); return 0; } OUTPUT Length: 8 Breadth: 15 This is for pre-increment operator. In next post, I will teach you overloading binary operator using member function.  So refer next  post for that topic. If This post Helped you, Please leave a comment, and share with your Coder Friends. Thank You. Keep Lea...
Read more

CSIT Object Oriented Programming with C++(Unary Operator Overloading) Part III

  I am assuming that, You have already studied Part I and II of Operator Overloading Series. So i n this post, I am going to teach you How to do Unary  operator Overloading . Before we get started towards our topic, I wanted to remind you, what  Unary Operator Really is? An operator which acts upon only one operator is called unary operator. For example: Increment operator, Decrement operator and Negation operator (Minus) which  acts as both unary as well as binary operator. Now, lets do coding to understand , how to perform unary operator overloading. Here, I will do Pre-Increment operator overloading. Have a look at this simple code and understand the basic. //Overloading pre-increment operator #include<iostream> class A{ int length,breadth; public: A(int l, int b) { length=l; breadth=b; } void operator ++() { ++length; ++breadth; } void display() { cout<<"Length: "<<length<<endl<<"Breadth: "<<breadth<<endl; } }; int main(...
Read more