C++ Classes and Objects Programming

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C++ class and Object

A class is a blue print and combination of Different functions and variables. The difference between C and C++ is that C is a procedural programming and does not support classes and objects, while C++ provide support of Object Oriented Programming(OOP) and classes therefore C++ can be called a hybrid language.

The variables and functions within a class are called members(variables,functions) of the class.

Syntax of C++ Class

A class definition starts with the keyword class.For example, we defined the Student data type using the keyword class as follows.

class Student{

public:

  string name; // member variables

  int rollNumber;

}

A public member can be accessed from outside the class anywhere within the scope of the class object. You can also specify the members of a class as private or protected.

Syntax of C++ Objects

A class is a blueprint for objects and an object is created from a class. We declare objects of a class with exactly the same sort of declaration that we declare variables of basic types
Declare two objects of class Student

Student s1;
Student s2;
Both of the objects s1 and s2 will have their own copy of data members.

The public data members of objects of a class can be accessed using the direct member access operator (.).

Example

Class

Objects

1. #include <iostream>  
2. using namespace std;
3. class Student{
4.   int rollNumber;
5.   string name;
6. };
7. int main( ){ 
8.     
9.    // declare Object of Student class
10.    Student s1;
11.    Student s2;
12. 
    
13.        s1.rollNumber = 10;
14.        s1.name = "Zub";
15.        cout << "Student Name :"<<s1.name<<endl;
16.        cout << "Student Roll Number :"<<s1.rollNumber<<endl;
17. 
    
18.        s2.rollNumber = 20;
19.        s2.name = "Zubair";
20.        cout << "Student Name :"<<s2.name<<endl;
21.        cout << "Student Roll Number :"<<s2.rollNumber<<endl;
22.    return 0;
23. }

Console :

Student Name :Zub
Student Roll Number :10
Student Name :Zubair
Student Roll Number :20

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