Advanced Programming Problem Session 9 Solution

In this PS, you are asked to implement overloaded operator functions and missing parts for a C++ class named Weight. We provide you C++ source/header file templates. Please put all your solutions in these files. The project includes declaration of the Weight class in file Weight.h. Note that we already provided the prototypes of some operator functions in Weight.h. You can use the main function (test.cpp) to test your implementation. You should implement the class Weight’s functions in file Weight.cpp.




The class Weight should include:




private integer data to keep weight information: kilogram and gram.



a default constructor that initializes weight to 1 kilogram and 0 gram.



overloaded addition (+) operator function to enable the addition of two weights. It sums the kilogram and gram fields of two objects, and makes necessary conversions. Note that the value of a gram field may change outside the range (0-999) after + operation. Make sure that you correctly handle gram to kilogram conversion in your implementation. See the sample output.



overloaded output stream (<<) operator for displaying a weight object in the format:



“Weight is <kilogram field kg and <gram field gr.”




overloaded equality (= =) operator to allow comparisons of two weight objects. The function should compare kilogram and gram fields separately, and returns true if both are the same.



overloaded inequality (!=) operator to allow comparisons of two weight objects. The function should compare kilogram and gram fields separately, and returns false if they are the same.



overloaded greater than () operator to allow comparisons of two weight objects. The function should compare kilogram and gram fields separately, and returns true:



if current object’s kilogram value is larger than the right object’s kilogram value, or



if current object’s gram value is larger than the right object’s gram value when both of their kilogram values are the same.



Add a static data named count to the Weight class. The count value should be initialized to 0, and it should keep track of the number of objects created out of Weight class. That is, every time a new object is created, value of count should be incremented within the class Weight appropriately (i.e. in the constructor). Every time an object is destroyed, value of count should be decremented within the class Weight (i.e. in the destructor).
You can test the above parts by using the code provided in test.cpp. See the sample output.












Testing class Weight

------------------------------




y = Weight is 4 kg and 800 gr.

z = Weight is 3 kg and 300 gr.

w = Weight is 3 kg and 300 gr.

t = Weight is 3 kg and 350 gr.




Test addition operation:

x = y + z

x = Weight is 8 kg and 100 gr.




k = z + w

k = Weight is 6 kg and 600 gr.




Test boolean operations:

Weight is 3 kg and 300 gr. == Weight is 3 kg and 300 gr.

Weight is 8 kg and 100 gr. != Weight is 4 kg and 800 gr.

Weight is 4 kg and 800 gr. Weight is 3 kg and 300 gr.

Weight is 3 kg and 350 gr. Weight is 3 kg and 300 gr.




The count of Weight objects is: 6




Created: Weight is 10 kg and 100 gr.

Created: Weight is 5 kg and 400 gr.

The count of Weight objects after adding two objects is: 8




To be removed: Weight is 10 kg and 100 gr.

To be removed: Weight is 5 kg and 400 gr.

The count of Weight objects after removing two objects is: 6