The use of virtual function means, in accordance with three kinds of different methods of calculation to find Fibonacci series, the first n items (specific items of value) and the output. Specifically, through the base class baseCla its derived classes fib1Cla, fib2Cla and fib3Cla described in the following virtual function with a " virtual double fib (int n) " , to achieve the first n order to Fibonacci sequence item value and return 3 different solutions are given. For example, can be designed and has been used in section 4 and Chapter 5 of the exercise achieved by solving method: simple variable " data translation" method, using an array implementation of law and the implementation method to use recursive functions.

3.cpp

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