Exercises

1.In a real inventory control program, we would need to do more than merely read the inventory information in from a disk file, as we have done in this chapter. We'd also want to be able to write the updated inventory back to the disk file via an ofstream object, which is exactly like an ifstream object except that it allows us to write to a file rather than reading from one. Modify the header files item5.h and invent1.h to include the declarations of the new functions StockItem::Write and Inventory::StoreInventory, needed to support this new ability.
2.Implement the new functions that you declared in exercise 1. Then update the test program to write the changed inventory to a new file. To connect an ofstream called OutputStream to a file named "test.out", you could use the line: 
ofstream OutputStream("test.out");

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