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++
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