Difference Between Default and Parameterless Constructor in C++

Constructor is an important concept to understand in Object Oriented Programming and we have many constructors like default, parameterized, and copy constructors. Many get confused that is there any difference between a default constructor and a parameterless constructor. 

In C++, a default constructor and a parameterless constructor are similar in that they both create objects without requiring any arguments. However, there is a subtle difference between the two.

Default Constructor.

A default constructor is a constructor that the compiler generates automatically if no constructor is defined explicitly for a class. The default constructor has no parameters and initializes the data members of the object to their default values (which are typically zero for numeric types and null or empty for pointers and strings).

Example:

class MyClass {
public:
    MyClass() {
        // Default constructor
        // Initialize data members with default values
    }
};

Parameterless Constructor.

A parameterless constructor, on the other hand, is a constructor that is defined explicitly by the programmer and has no parameters. The programmer can define the behavior of the parameterless constructor to initialize the object in any way they see fit.

Example:

class MyClass {
public:
    MyClass(int value) {
        // Parameterized constructor
        // Initialize data members with the provided 'value'
    }
};