What is the difference between pointers and references in c++?

?

Pointers stores address of variable but references refers an existing variable with another name.

and const int *const ptr

In C++, this pointer is a pointer that points to the object on which a member function is called. It allows the member function to access and modify the object's data members.

Here's a concise example of this pointer in C++:

#include <iostream>
class MyClass
{
public:
int data;

MyClass(int data)
{
this->data = data; // 'this' is used to access the member variable
}

void display()
{
std::cout << "Data: " << this->data << std::endl;
}
};

int main()
{
MyClass object(2);
object.display();
return 0;
}

Reference
1) References are used to refer an existing variable in another name.
2) References cannot have a null value assigned.
3) A reference variable can be referenced by pass by value.
4) A reference shares the same memory address with the original variable but also takes up some space on the stack.
ETC


Pointer(*)
1) Pointer are used to store address of variable.
2) Pointer can be NULL.
3) A pointer can be referenced but pass by reference.
4) A pointer has its own memory address and size on the stack.
ETC