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What is the difference between virtual functions and pure virtual functions? |
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Answer» A virtual function is a member function in the base CLASS that you redefine in a derived class. It is declared using the virtual keyword. Example- class base{public: virtual VOID fun(){ }};A pure virtual function is a function that has no IMPLEMENTATION and is declared by assigning 0. It has no body. Example- class base{public: virtual void fun()=0;};Here, = sign has got nothing to do with the assignment, and value 0 is not assigned to anything. It is used to SIMPLY tell the compiler that a function will be pure and it will not have anybody. |
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