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labs/inheritance/README.md

@@ -72,7 +72,7 @@ Label the virtual inheritance paths in your diagram. Hint: 6 of the inheritance
 To start the implementation, we’ll focus on just 7 of those shapes: Polygon, Triangle, Quadrilateral, Isosceles Triangle, Equilateral Triangle, Rectangle, and Square. This subset will allow us to initially ignore the multiple inheritance diamond property and the need for virtual inheritance it causes.
 
 Download the code and initial example: [simple_main.cpp](cp2/simple_main.cpp), [utilities.h](cp2/utilities.h), [simple.txt](cp2/simple.txt), [output_simple.txt](cp2/output_simple.txt). 
-The program expects 2 command line arguments, the names of the input and output files. Each line of the input file begins with a string name followed by 3 or more 2D coordinate vertices. The output categorizes each shape into one or more classes, and into groups with equal angles, equal edges, and/or a right angle. The provided code includes code to call the constructors of the different classes, generally ordered from most specific/constrained to least specific. For example, the program will try to create a Square with the data first, and only if that constructor fails (throws an exception) then it will try to create a Rectangle. We also include a utilities.h file with a number of simple geometric operations: e.g., calculate the distance between two points, calculate the angle between two edges, and compare two distances or two angles and judge if they are sufficiently close to be called “equal”. Remember that you usually don’t want to check if two floating point numbers are equal; instead, check if the difference is below an appropriate tolerance.
+The program expects 2 command line arguments, the names of the input and output files. Each line of the input file begins with a string name followed by 3 or more 2D coordinate vertices. The output categorizes each shape into one or more classes, and into groups with equal angles, equal edges, and/or a right angle. The provided code includes code to call the constructors of the different classes, generally ordered from most specific/constrained to least specific. For example, the program will try to create a Square with the data first, and only if that constructor fails (throws an exception) then it will try to create a Rectangle. We also include a utilities.h file with a number of simple geometric operations: e.g., calculate the distance between two points, calculate the angle between two edges, and compare two distances or two angles and judge if they are sufficiently close to be called “equal”. **Remember that you usually don’t want to check if two floating point numbers are equal; instead, check if the difference is below an appropriate tolerance.**
 
 Create a polygons.h file (and optionally a polygons.cpp file). Create the 7 classes for these shapes deriving classes from the other classes as appropriate. In each constructor write code to check whether the vertices passed in meet the requirements for that shape. Throw an exception if you find a problem. Note: Just throw a value of type integer. The value thrown is unimportant in this program – it will be ignored.