How1.Objects
Objects are the basic unit of OOP. They are instances of class, which have data members
and uses various member functions to perform tasks.
Why2.Class
It is similar to structures in C language. Class can also be defined as user defined data type
but it also contains functions in it. So, class is basically a blueprint for object. It declare &
defines what data variables the object will have and what operations can be performed on
the class's object.
Witch3.Abstraction
Abstraction refers to showing only the essential features of the application and hiding the
details. In C++, classes can provide methods to the outside world to access & use the data
variables, keeping the variables hidden from direct access, or classes can even declare
everything accessible to everyone, or maybe just to the classes inheriting it. This can be
done using access specifiers.
How4.Encapsulation
It can also be said data binding. Encapsulation is all about binding the data variables and
functions together in class.
Why5.Inheritance
Inheritance is a way to reuse once written code again and again. The class which
is inherited is called the Base class & the class which inherits is called
the Derived class. They are also called parent and child class.
So when, a derived class inherits a base class, the derived class can use all the what6.Polymorphism
It is a feature, which lets us create functions with same name but different arguments,
which will perform different actions. That means, functions with same name, but
functioning in different ways. Or, it also allows us to redefine a function to provide it
with a completely new definition. You will learn how to do this in details soon in coming
lessons.
This7.Exception Handling
Exception handling is a feature of OOP, to handle unresolved exceptions or errors
produced at runtime.
Why Keywords
Keywords in C++ refer to the pre-existing, reserved words, each holding its own
position and power and has a specific function associated with it.
It is important to note that we cannot use C++ keywords for assigning variable names as
it would suggest a totally different meaning entirely and would be incorrect.
WitchIdentifiers
C++ allows the programmer to assign names of his own choice to variables, arrays,
functions, structures, classes, and various other data structures called identifiers. The
programmer may use the mixture of different types of character sets available in C++ to
name an identifier.
Rules for C++ Identifiers
There are certain rules to be followed by the user while naming identifiers, otherwise, you would
get a compilation error. These rules are:
What 1. First character: The first character of the identifier in C++ should positively begin with
either an alphabet or an underscore. It means that it strictly cannot begin with a number.
This2. No special characters: C++ does not encourage the use of special characters while
naming an identifier. It is evident that we cannot use special characters like the
exclamatory mark or the “@” symbol.
Why3. No keywords: Using keywords as identifiers in C++ is strictly forbidden, as they are
reserved words that hold a special meaning to the C++ compiler. If used purposely, you
would get a compilation error.
What4. No white spaces: Leaving a gap between identifiers is discouraged. White spaces
incorporate blank spaces, newline, carriage return, and horizontal tab.
You must be logged in to post a comment.