Flesh out Programming Problem 15.1. Give new definitions for the various constructors and member functions Figure::center, Figure::draw, Figure::erase, Triangle::draw, Triangle::erase, Rectangle::draw, and Rectangle::erase so that the draw functions actually draw figures on the screen by placing the character '*' at suitable locations on the screen. For the erase functions, you can simply clear the screen (by outputting blank lines or by doing something more sophisticated). There are a lot of details in this and you will have to decide on some of them on your own.
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