Constructors in C++

A constructor is a member function with the same name as the class itself. It has no return type, not even void. The purpose of a constructor is to initialize the object of the class. When you create an object of a class, the constructor is automatically called to set up the initial state of the object. This ensures that the object is in a valid state and ready to be used.

In the below PDF we discuss about Constructors in detail in simple language, Hope this will help in better understanding.

Types of Constructors:

In C++, there are several types of constructors, each serving a different purpose:

1. Default Constructor:
A default constructor is one that takes no parameters. It is automatically called when an object is created without any arguments. If you don’t define a constructor for your class, the compiler will generate a default constructor for you. It initializes the object with default values (e.g., initializes numeric types to zero).

class MyClass {
// Default constructor
MyClass() {
// Initialization code goes here

2. Parameterized Constructor:
A parameterized constructor takes one or more parameters and allows you to initialize an object with specific values when it’s created.

class MyClass {
// Parameterized constructor
MyClass(int value) {
// Initialize object with the given value

3. Copy Constructor:
The copy constructor is used to create a new object as a copy of an existing object. It is invoked when you create a new object by copying an existing one.

class MyClass {
// Copy constructor
MyClass(const MyClass& other) {
// Initialize the object as a copy of 'other'

Understanding Classes:

In C++, a class is a blueprint or template for creating objects. It defines a set of attributes (data members) and methods (member functions) that describe the properties and behavior of objects belonging to that class. Classes are user-defined data types, and they encapsulate both data and the operations that can be performed on that data.

Let’s create a simple example of a Car class to better understand the concept:

class Car {
// Data members
std::string make;
std::string model;
int year;

// Member functions
void start() {
std::cout << "The car is starting." << std::endl;

void stop() {
std::cout << "The car is stopping." << std::endl;

In this example, we’ve defined a Car class with data members (make, model, and year) and member functions (start() and stop()). The data members represent the car’s attributes, while the member functions define the actions a car can perform.

Related Question

A constructor in C++ is a special member function that gets called automatically when an object of a class is created. It is used to initialize the object’s data members and perform any necessary setup.

Yes, a class in C++ can have multiple constructors, which is known as constructor overloading. These constructors can have different parameter lists, allowing you to create objects with different initialization options.

The default constructor is a constructor that is provided by the C++ compiler if you don’t define any constructors in your class. It initializes the object’s data members to default values (e.g., zero for numeric types).

Yes, constructors can have parameters. Constructors with parameters allow you to pass values to initialize the object’s data members when the object is created.

The copy constructor is a special constructor used to create a new object as a copy of an existing object of the same class. It is automatically called when you create a new object by copying an existing one.



Storage Classes in C++ In

Preprocessors in C++ A preprocessor

Standard Template Library in C++

Exception Handling in C++ Exception

Destructors in C++ A destructor

Inheritance in C++ Inheritance is

C++ Classes and Objects C++

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