Skip to main content

Introduction to Function Overloading in C++

Let us start this with a question!

All of you know that we cannot have two variables of the same name, but can we have two Functions having the same name.

The answer is YES, we can have two functions of the same name by a method known as function overloading and the functions having the same name are known as overloaded functions.

So, what’s the use of Function Overloading

Function overloading is one of the most powerful features of C++ programming language. It forms the basis of polymorphism (compile-time polymorphism).

Most of the time you’ll be overloading the constructor function of a class.

How function overloading is achieved

One thing that might be coming to your mind is, how will the compiler know when to call which function, if there are more than one function of the same name.

The answer is, you have to declare functions in such a way that they differ either in terms of the number of parameters or in terms of the type of parameters they take.

What that means is, nothing special needs to be done, you just need to declare two or more functions having the same name but either having different number of parameters or having parameters of different types.

Example 1: Overloading Functions that differ in terms of NUMBER OF PARAMETERS

  //Example Program in C++
  #include<iostream.h>

  //FUNTION PROTOTYPES
  int func(int i);
  int func(int i, int j);

  void main(void)
  {
   cout<<func(10);//func(int i)is called

   cout<<func(10,10);//func(int i, int j) is called
  }

  int func(int i)
  {
   return i;
  }

  int func(int i, int j)
  {
   return i+j;
  }

Example 2: Overloading Functions that differ in terms of TYPE OF PARAMETERS

  //Example Program in C++
  #include<iostream.h>

  //FUNTION PROTOTYPES
  int func(int i);
  double func(double i);

  void main(void)
  {
   cout<<func(10);//func(int i)is called

   cout<<func(10.201);//func(double i) is called
  }

  int func(int i)
  {
   return i;
  }

  double func(double i)
  {
   return i;
  }

One more Question, is the program below, valid?

  //Example Program in C++
  #include<iostream.h>

  //FUNTION PROTOTYPES
  int func(int i);
  double func(int i);

  void main(void)
  {
   cout<<func(10);

   cout<<func(10.201);
  }

  int func(int i)
  {
   return i;
  }

  double func(int i)
  {
   return i;
  }

No, because you can’t overload functions if they differ only in terms of the data type they return.

I Hope this article throws some light on function overloading!

Good-Bye for now

Thanks for reading…

Do check back for updates!

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 Remove Bullet Points in CSS

This will be a short guide on how to remove bullet points from ordered/unordered lists with CSS, you only need two lines of CSS for this. The first removes the actual bullet points and the second one removes the space to the left, as evident from the following video: We'll also be doing some bullet beautification in the last section if that's what you are looking to do. How to Remove Bullet Points in HTML/CSS Now that we know what CSS properties actually accomplish what we want let's see how we can implement this in our HTML code. Using Inline "style" Tag (The quick and dirty way) As the title suggests, this is the quickest way to remove bullet points in which you wouldn't have to edit any CSS files (for example, for Blogger or WordPress). This method would be useful for a one-off case - just add the following " style " attribute to the list you want to remove the bullet points from: <h1>Ordered List</h1> <ol  style="list-styl