Example of encapsulation in OOP with CPP/C++

 #include<iostream>

using namespace std;
class Encapsulation
{
    private:
        /// data hidden from outside world
        int x;
    public:
        /// function to set value of variable x
        void set(int a)
        {
            x = a;
        }
        /// function to return value of variable x
        int get()
        {
            return x;
        }
};
/*
Here all the data members and functions are
encapsulated into Encapsulation unit.
*/
int main()
{
    Encapsulation obj;
    obj.set(5);
    cout<<obj.get() << endl;
    return 0;
}