added review01 for chapter12

Author: trapperdot00

Chapter12/README.md

@@ -25,3 +25,7 @@ Define a class `D2` derived from `D1` and override `pvf()` in `D2`. Make an obj
 
 ## [Drill 7](drill/07)
 Define a class `B2` with a pure virtual function `pvf()`. Define a class `D21` with a `string` data member and a member function that overrides `pvf()`; `D21::pvf()` should output the value of the `string`. Define a class `D22` that is just like `D21` except that its data member is an `int`. Define a function `f()` that takes a `B2&` argument and calls `pvf()` for its argument. Call `f()` with a `D21` and a `D22`.
+
+
+## [Review 1](review/01.txt)
+What is an application domain?

Chapter12/review/01.txt

@@ -0,0 +1,4 @@
+An application domain is a method of presenting a set of fundamental
+application concepts and facitilites to programmers.
+The ideal is for the code to directly represent the concepts of the
+application domain in our program designs.