(iii) It is possible to add new entity into a program systematically and easily without mod-
ifying old code. For example, if a cone (conical shape) type of metal is added, one can
write ConicalMetal class and add ConicalMetal.h, ConicalMetal.cpp les. It becomes easy
because modi cation in the existing code is not required except for the addition of
the code in main.cpp
related to the new entity.
(iv) It is possible to remove existing entity from a program, systematically and easily without
modifying old code. For example, if the SphericalMetal type of metal is removed, one
can remove SphericalMetal class by removing ...
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