CMPS 222 - Homework 2

Homework 2 - Basic Classes

Due: Wednesday January 25, 2012 at 5:30pm

Coding Conventions

Use the same coding conventions as described in Homework 1. Additionally, make sure to indent each section of the class in the class definition.

Assignment

For this assignment, you will be modifying the structure from Homework 1 into a class. Your ProductInfo class will contain the following member variables in the private section:

A C-style string for the product name
A C-style string for the product description
A 13 character C-style string for the UPC (Universal Product Code)
An integer for how many of that product are in stock

Your class will now have the following member functions in the public section:

Default constructor - Sets name, description and UPC to the empty string. Sets the number of products in stock to 0.
Constructor that takes four parameters (three strings and one integer) - Sets the name, description, UPC and number in stock to the corresponding parameter
Accessor functions for each member variable. The accessor functions MUST be const functions. The ones that return a string MUST return a const character pointer. The functions are:
- getName - returns a string containing the name
- getDescription - returns a string containing the description
- getUPC - returns a string containing the UPC
- getStock - returns an integer for the number of products in stock
Mutator functions for each member variable:
- setName(char *) - Copies the given string into the name. Make sure to limit the number of characters copied to the maximum number of characters your name string supports.
- setDescription(char *) - Copies the given string into the description. Again, limit the number of characters copied to the number of characters in your description string.
- setUPC(char *) - Copies the given string into the UPC. Only copy 13 characters over to the UPC.
- setStock(int) - Sets the number of products in stock to the given integer.
inputProduct - Prompts the user to set each one of the product fields for the current object (similar to addProduct for Homework 1).
printProduct - Prints all the product fields to the screen (similar to showProduct for Homework 1).

Additionally, your member functions must enforce the following constraint:

The number of items in stock must be greater than or equal to 0.

Main Function

Your main() function will create an array of products, similar to Homework 1. However, this time you will use the following menu to drive your main() function. You can do all of the menu operations within main() or you can add functions to support the menu operations. See menu_example.cpp for an example of a menu-driven program.

         Welcome to the CS222 Homework 2 Menu
  ===================================================
  1.  Input all product information from the keyboard
  2.  Print all product information to the screen
  3.  Edit the stock level for a single product

  0.  Exit
  ===================================================

Option 0 will deallocate the array if it is allocated and exit the menu loop.

Option 1 will work similarly to Homework 1. It should prompt the user for how many products there are, verify that the number of products is greater than 0, dynamically allocate an array of products and then call inputProduct for each item in the array. If the user selects Option 1 a second time, the old array MUST be deallocated before following the above steps.

Option 2 will loop through all products in the array and call printProduct. If the user has NOT selected Option 1 yet (there is no array allocated), Option 2 should print an error message reminding the user to select Option 1 first. (Hint: If the pointer is NULL, no array has been allocated yet.)

Option 3 will print all the products and ask the user which product they wish to update. It will then ask the user what the new stock level is for that product. It will then update that product to the new stock level and reprint just the selected product to show the user that the new stocking level has been set. All of these steps will be done using the accessor and mutator functions in the class. As with Option 2, if the user selects Option 3 before selecting Option 1, you should print an error message reminding the user to select Option 1 first.

Important Items

You will lose points if you do not implement these important features in your menu program:

Option 0 MUST only deallocate the array IF it has been allocated (i.e. if Option 1 has been selected).
If Option 1 is selected more than once, the old array MUST be deallocated BEFORE new is called again.
Option 1 must verify that the size given by the user is greater than 0 before calling new.
Option 1 must use the try-catch block when calling new. If the allocation fails, set the pointer to NULL, print an error message and return to the menu.
If Options 2 or 3 are selected before Option 1, your program MUST print an error message to the screen and return to the menu. It should NOT cause a segmentation fault.
Option 3 MUST use the accessor and mutator functions to show the products, change the stocking level, and show the resulting change. It cannot use inputProduct and printProduct.
Option 3 MUST validate that the product number the user wishes to edit is within the array. If the product number is invalid, Option 3 should print an error message and return to the menu.

Test that you have properly implemented these items by running your menu with out-of-order input. For example, run it once and immediately select 0 to exit without selecting any other option and make sure it gracefully exits. Then run it again and select 3 and make sure it prints an error message and returns to the menu. Do not just test your code by selecting 1, then 2, then 3.

Email the completed source code to me.