Problems understanding inheritance.
I'm having trouble understanding some concepts of inheritance. I'm doing an assignment where I have to design a basic bank system, and it's asking me to make a class derived of a base class. Here's the exact question:
Now, I may be understanding the instructions wrong, but am I supposed to be using the functions from the base class to modify members of the derived class? If so, how do I do that? Here's my code so far, but when I create a new savingsAccount object, it sets the default values from the constructor of the bankAccount class. I haven't tested the other savingsAccount functions, but I have a feeling it's the same problem. Here's the code:
(Code was too large to paste here. Here's a pastebin link: http://pastebin.com/dB1pU1be)
c. Every bank offers a savings account. Derive the class savingsAccount from the class bankAccount (designed in part (a)). This class inherits members to store the account number and the balance from the base class. A customer with a savings account typically receives interest, makes deposits, and withdraws money. In addition to the operations inherited from the base class, this class should provide the following operations: set interest rate, retrieve interest rate, post interest, withdraw (override the method of the base class), and print account information. Add appropriate constructors. |
Now, I may be understanding the instructions wrong, but am I supposed to be using the functions from the base class to modify members of the derived class? If so, how do I do that? Here's my code so far, but when I create a new savingsAccount object, it sets the default values from the constructor of the bankAccount class. I haven't tested the other savingsAccount functions, but I have a feeling it's the same problem. Here's the code:
(Code was too large to paste here. Here's a pastebin link: http://pastebin.com/dB1pU1be)
Last edited on
You can't have the base's methods modify members of the derived class. That doesn't make sense. I'm not sure I understand what you are asking.
When derived classes are constructed, the base class's constructor is called first. This is the expected behavior; the base class should initialize it's values with it's constructor, and the derived class should initialize it's own.
When derived classes are constructed, the base class's constructor is called first. This is the expected behavior; the base class should initialize it's values with it's constructor, and the derived class should initialize it's own.
I think I was confused because of the wording of the problem. It's asking me to override the method of the base class, meaning I need to put a call to the base class function in the definition of the derived class' function, right? So I thought the base class' function had to modify the balance member of the savingsAccount object when it was called through the savingsAccount object.
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