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How can we make a class abstract?

Review the verified answer and explanation for this DemoPaper-Pakistan past-paper question on CampusFin.

How can we make a class abstract? Answer: By making at least one member function as pure virtual function.

Question context

This question is part of ⚙️ C++ Programming within the broader 💻 Programming subject and appears in the DemoPaper-Pakistan preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.