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Which of the provided options is the correct way to declare a pure virtual function?

Question

Which of the provided options is the correct way to declare a pure virtual function?

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Solution

A pure virtual function in C++ is declared by assigning 0 in declaration. Here is the correct way to declare a pure virtual function:

class AbstractClass {
public:
    virtual void pureVirtualFunction() = 0; // Pure Virtual Function
};

In this example, pureVirtualFunction is a pure virtual function. The = 0 part is what makes it "pure". This means the function has no body in the abstract class, and must be implemented in any non-abstract class that derives from this class.

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