Can you explain the difference between a default constructor and a parameterized constructor

Can you explain the difference between a default constructor and a parameterized constructor

Can you explain the difference between a default constructor and a parameterized constructor?

A default constructor is a constructor that either has no parameters, or if it has parameters, all the parameters have default values. If no user-defined constructor exists for a class A and one is needed, the compiler implicitly declares a default parameterless constructor A::A(). This constructor is an inline public member of its class.

On the other hand, a parameterized constructor is a constructor that takes at least one argument. It allows us to initialize objects with different states. The number of arguments can vary as per requirement. For example, in C++ we could define a parameterized constructor for a class ‘Rectangle’ like this:

class Rectangle {
public:
    int width, height;
    Rectangle(int w, int h) : width(w), height(h) {}
};
In this case, when creating an object of type ‘Rectangle’, we must provide two integers which will be used to initialize the ‘width’ and ‘height’ attributes respectively.