Skip to main content

Introduction to Operator Overloading in C++ II

From the previous article Introduction to Operator Overloading in C++, we know that we can overload operators by defining member functions having special names. The general form, as you know, for overloading operators is:

ret-type operator#(arg-list);

Although, you’re free to use any return type as ret-type but commonly it’ll be the name of the class itself; in this article we’ll be closely examining why is it so and what would happen if we use other return types.

You may not expect further theories in this article as all the further discussion is in the program as comments.

I request you to read the program thoroughly so you may understand what we’re discussing.

  // Example program to illustrate
  // operator overloading with diff rent
  // return-types used in the overload
  // function 
  #include <iostream.h>

  // class
  class myclass
    int a;

    // default constructor

    // constructor
    myclass(int x){a=x;}

    // overloaded operator
    // with return type 'myclass'
    myclass operator +(myclass);

    void show(){cout<<a<<endl;}

  myclass myclass::operator +(myclass ob)
    myclass t;

    t.a=a + ob.a;

    return t;

  // other class
  class myclass2
    int a;

    // default constructor

    // constructor
    myclass2(int x){a=x;}

    // here, return type is
    // 'int'
    int operator +(myclass2);

    void show(){cout<<a<<endl;}

  int myclass2::operator +(myclass2 ob)
    int t;

    t=a + ob.a;

    return t;

  void main()
    myclass ob1(10);
    myclass ob2(20);

    myclass2 ob3(100);
    myclass2 ob4(200);

    int a;

    // this is legal because
    // the class to which ob1 and ob2
    // belong, upon '+' operation return
    // data of type 'myclass' 

    // here the result of the '+'
    // operation return data of type
    // 'int' which is assigned to the
    // variable 'a' (of data type int)

Related Articles:

Popular posts from this blog

Fix For Toshiba Satellite "RTC Battery is Low" Error (with Pictures)

RTC Battery is Low Error on a Toshiba Satellite laptop "RTC Battery is Low..." An error message flashing while you try to boot your laptop is enough to panic many people. But worry not! "RTC Battery" stands for Real-Time Clock battery which almost all laptops and PCs have on their motherboard to power the clock and sometimes to also keep the CMOS settings from getting erased while the system is switched off.  It is not uncommon for these batteries to last for years before requiring a replacement as the clock consumes very less power. And contrary to what some people tell you - they are not rechargeable or getting charged while your computer or laptop is running. In this article, we'll learn everything about RTC batteries and how to fix the error on your Toshiba Satellite laptop. What is an RTC Battery? RTC or CMOS batteries are small coin-shaped lithium batteries with a 3-volts output. Most laptops use

The Best Way(s) to Comment out PHP/HTML Code

PHP supports various styles of comments. Please check the following example: <?php // Single line comment code (); # Single line Comment code2 (); /* Multi Line comment code(); The code inside doesn't run */ // /* This doesn NOT start a multi-line comment block /* Multi line comment block The following line still ends the multi-line comment block //*/ The " # " comment style, though, is rarely used. Do note, in the example, that anything (even a multi-block comment /* ) after a " // " or " # " is a comment, and /* */ around any single-line comment overrides it. This information will come in handy when we learn about some neat tricks next. Comment out PHP Code Blocks Check the following code <?php //* Toggle line if ( 1 ) {      // } else {      // } //*/ //* Toggle line if ( 2 ) {      // } else {      // } //*/ Now see how easy it is to toggle a part of PHP code by just removing or adding a single " / " from th

How to Create an HTML Form Linked with MySQL Database in PHP

If you're looking for example code and detailed discussion on how to create an HTML form that stores data in a MySQL database using PHP then this post might be what you're looking for. I assume that you're familiar with basic HTML, CSS, PHP coding, and  MySQL. I am going to divide this small project into two parts: The HTML form itself that takes input from the user and the PHP script that saves it into the database A table that displays the user-added data that has been saved in the database. We'll be dealing with the first part in this tutorial. Again I'd like to break this problem into a few parts so that it's easier for you to understand and probably gives you an insight into how breaking up a problem into smaller chunks can help make things clearer in your mind. Let's think about it, there is an HTML form (that is HTML code), then there is the PHP code that deals with the user-input data, and the MySQL database itself. For this tutorial, we'll b