C++ Access Control Question:

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User defined data type which contains data and methods to manipulate that data; is known as class. It is the fundamental packaging unit of OO technology. An object is a variable of a Class. Each object is associated with the data of type class with which it is created. Thus we can also say that class is a collection of objects of similar types. It is a user defined data type and behaves like built-in data type of the language. Since class has data and methods to manipulate the data, it supports one of the most important features of OO: Data Encapsulation.

Eg.
class Student
{
int rollno;
int marks1, marks2;
public:
void show(int r); // to print marks
void sum(int r); // to add the marks
};

We can create objects of class using:
class Student s1, s2;