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KwickClips Cyber Safety and Ethics · 40 sec · free

Where is virtual written?

Short answer. In the base class.

Who decides which draw runs?

The real object.

Remember

virtual in the base class
Call through a base pointer
Real object decides

Your circle printed Shape. One word fixes it. Write virtual in the base class. Now p points to circle c, so Circle's draw runs at run time. Write virtual in the base. Call through a base pointer. The real object decides.

This clip is from the full lesson: Polymorphism and Virtual Functions — 7 minutes, with the tables, the quick answers and the whole lesson in text.

Useful for: Programming All levels C++

More KwickClips from this lesson

Table comparing compile time and run time: binding, uses, speed.Is overloading compile time or run time?40 secC++ struct B with operator+ returning B{a + x.a}, t{10} + v{25} gives 35.What is the function named?41 secC++ code struct Shape { virtual int area() = 0; }; Shape s; with an error comment.What makes a class abstract?42 sec
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