Program to implement run time polymorphism using C++


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Following is the question asked in MSBTE(Maharashtra State Board of Technical Education, Mumbai) Diploma in Computer Engineering question paper for Summer 2017 examination.
This question is asked for 4 marks and hence requires some explanation along with program code. Please let me know the solution.
Q) Create class shape. Derive two classes Triangle and Rectangle. Accept dimensions of Triangle and Rectangle with appropriate functions. Make area() function virtual which is common to all classes. With area function calculate area of triangle and rectangle. Display the result.[4 Marks]