Data abstraction

 #include<iostream>;

using namespace std;

//abstract class
//abstract class at list one abstarct method
class ABC {
    public:
        //abstract method 
        //pure virtual function
        virtual void Sum() = 0;

};

class B:ABC {
    public:
        void Sum() override {
        cout << "Call Sum";
    }

};


int main() {
    //ABC obj;
    B obj;

    return 0;
}

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