# l14 - CSci 1113 C/C for Scientists and Engineers Section...

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: CSci 1113 C/C++ for Scientists and Engineers Section 010 - evening class Object Oriented Programming in C++. Inheritance, ad-hoc polymorphism Prof. Eric Van Wyk and Ted Kaminski Spring 2010 c ± Van Wyk and Kaminski CSci 1113: C/C++ for Scientists and Engineers, evening class Spring 2010 Page 1 / 25

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: I Lab midterm exam. Check that your score is in GRIT. We have two exams with no names - so two people have zeros that deserve better. c ± Van Wyk and Kaminski CSci 1113: C/C++ for Scientists and Engineers, evening class Spring 2010 Page 2 / 25
Polymorphism : Motivating example I Previously, we pointed out that we couldn’t write a Newton-Raphson function. I We could as soon as we introduced classes, but it still wasn’t general enough. I Today, we’ll introduce polymorphism which solves this problem. c ± Van Wyk and Kaminski CSci 1113: C/C++ for Scientists and Engineers, evening class Spring 2010 Page 3 / 25

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Polymorphism : I First: a teaser. c ± Van Wyk and Kaminski CSci 1113: C/C++ for Scientists and Engineers, evening class Spring 2010 Page 4 / 25
Polymorphism : Child classes class Derived : public Base { I Derived “is a ” Base. I Base *p = new Derived(); I What’s the point of that? c ± Van Wyk and Kaminski CSci 1113: C/C++ for Scientists and Engineers, evening class Spring 2010 Page 5 / 25

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Polymorphism : virtual functions I Functions in a base class can be declared virtual. I Derived classes can override these functions. I Base *p = new Derived(); p->some virtual f(); I Calls the Derived class’s function. I This is called polymorphism. c ± Van Wyk and Kaminski CSci 1113: C/C++ for Scientists and Engineers, evening class Spring 2010 Page 6 / 25
Polymorphism : Example I Diving right into an example. I Let’s think for a second about functions of the form f ( x ). I Function.h and friends will be posted on the website. c ± Van Wyk and Kaminski CSci 1113: C/C++ for Scientists and Engineers, evening class Spring 2010 Page 7 / 25

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Polymorphism : Recapping I Some terminiology: Abstract base class. Cannot be instantiated because it contains pure virtual functions.
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l14 - CSci 1113 C/C for Scientists and Engineers Section...

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