Abstraction in C++

Data abstraction refers to, providing only essential information to the outside world and hiding their background details, i.e., to represent the needed information in program without presenting the details.

Abstraction in C++ Object Oriented Programming has a special feature called data abstraction. Data abstraction allows ignoring the details of how a data type is represented.

Syntax of Abstraction in C++

#include <iostream>
using namespace std;
int main( )
{
cout << "Hello C++" <<endl;
return 0;
}

Example of Abstraction in C++

#include <iostream>
using namespace std;
class Adder
{
public:
// constructor
Adder(int i = 0)
{
total = i;
}
// interface to outside world
void addNum(int number)
{
total += number;
}
// interface to outside world
int getTotal()
{
return total;
};
private:
// hidden data from outside world
int total;
};
int main( )
{
Adder a;

a.addNum(10);
a.addNum(20);
a.addNum(30);
cout << "Total " << a.getTotal() <<endl;
return 0;
}