Data abstraction is a process of representing the essential features without including implementation details. https://www.sitesbay.com/cpp/cpp-abstraction Data abstraction is the process of representing essential details not including internal details. Example index of the book

1. Abstraction in C++
Abstraction in C++ is not new concept it is oop’s concept which is used to hide background detail and
show only essential features.
Data abstraction is a process of representing the essential features without including implementation
details.
Data abstraction is the process of representing essential details not including internal details. Example
index of the book
Data abstraction refers to, providing only essential features by hiding its background details.
Example:
class result
{
int marks;
float percentage;
char name[20];

2. void input();
void output();
}
main()
{
bank b1;
b1.input();
b1.output();
}
In the above example, b1 is an object calling input and output member functions, but that code is
invisible to the object b1.
Abstract Class
Abstract Class is a class which contains at least one Pure Virtual function in it.
Characteristics of Abstract Class
 Abstract class cannot be instantiated, but pointers and references of Abstract class type can be
created.
 Abstract class can have normal functions and variables along with a pure virtual function.
 Abstract classes are mainly used for Up-casting, so that its derived classes can use its interface.
 Classes inheriting an Abstract Class must implement all pure virtual functions, or else they will
become Abstract too.