what is the difference between C and C++? what is the difference between scanf

what is the difference between C and C++?
what is the difference between scanf and gets?
what is mean by extern what is the use of it?
what will happen if i say delete this>
Difference between C structure and C++ structure?
What is the difference between overloading and overridding?
Explain the need for "virtual Destructor"
Can we have "virtual Constructors"?
What is the different types of polymorphism>
What is virtual functions? How to implement virtual function
in "C"?
What are the different types of storage classes?

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