Accessing Data Members
The public data members are also accessed in the same way given however the private data members are not allowed to be accessed directly by the object. Accessing a data member depends solely on the access control of that data member. This access control is given by Access modifiers in C++. There are three access modifiers: public, private, and protected.
C++
// C++ program to demonstrate accessing of data members #include <bits/stdc++.h> using namespace std; class Geeks { // Access specifier public: // Data Members string geekname; // Member Functions() void printname() { cout << "Geekname is:" << geekname; } }; int main() { // Declare an object of class geeks Geeks obj1; // accessing data member obj1.geekname = "Abhi"; // accessing member function obj1.printname(); return 0; } |
Geekname is:Abhi
C++ Classes and Objects
Class in C++ is the building block that leads to Object-Oriented programming. It is a user-defined data type, which holds its own data members and member functions, which can be accessed and used by creating an instance of that class. A C++ class is like a blueprint for an object. For Example: Consider the Class of Cars. There may be many cars with different names and brands but all of them will share some common properties like all of them will have 4 wheels, Speed Limit, Mileage range, etc. So here, Car is the class, and wheels, speed limits, and mileage are their properties.
- A Class is a user-defined data type that has data members and member functions.
- Data members are the data variables and member functions are the functions used to manipulate these variables together, these data members and member functions define the properties and behavior of the objects in a Class.
- In the above example of class Car, the data member will be speed limit, mileage, etc, and member functions can be applying brakes, increasing speed, etc.
An Object is an instance of a Class. When a class is defined, no memory is allocated but when it is instantiated (i.e. an object is created) memory is allocated.