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confused about class in a class in yet another class

Auris (9)
I know it's such a basic question, but I am just blinded..

I have a class Account, then a class AccountList that contains an array of type Account, then class Bank that contains AccountList.

in class Account there is a method int get_balance() ,
in class Bank I need to implement a method int total_balance(),
which will add all balances of Accounts that are in the AccountList.

I understand I should run a 'for-loop' through the list and call get_balance() and add them up +=, but I am confused about the actual syntax. I can call methods one level lower no problem though.. any suggestions? Thanks.


this is what i tried and obviously it's wrong

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int Bank::total_balance(){
    
    int totalBalance;
      
    for (int i = 0; i<accountList.size(); i++) {
        totalBalance += accountList.get(i).get_balance();
    }

    return totalBalance;
}

here are the declarations of my classes:

Account.h

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class Account {
    int account_number;
    int balance;
    
public:
    Account();
    Account(int anr, int b);
    int get_account_number();
    void set_account_number(int anr);
    int get_balance();
    bool set_balance(int b);
    bool debit(int amount);
    bool credit(int amount);
    bool transfer(Account& other, int amount);
    void print();
    void println();
};


AccountList.h

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class AccountList {
    
    Account aList[3]; // 
    int sz;
    int capacity;
public:
    AccountList();
    bool add(Account& a);
    Account get(int i);
    int size();
    Account remove(int i);
    int find(int anr);
    void println();
    
};


Bank.h

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class Bank {

    AccountList accountList;
    
public:
    Bank();
    bool add_aacount(Account& a);
    bool remove_account(int i);
    int total_balance();
    void print();
    void println();
    
};
Last edited on
kbw (9488)
You're missing the initialisation:
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int Bank::total_balance(){
    
    int totalBalance = 0;
      
    for (int i = 0; i<accountList.size(); i++) {
        totalBalance += accountList.get(i).get_balance();
    }

    return totalBalance;
}
Auris (9)
I thought it automatically initializes to 0, but yes, c++ is nasty with these things. Thanks. However my problem persists. It returns a 0 all the time. If i call get_balance() of class Account in main, it returns correctly. But in Bank.cpp wont do it.
Last edited on
Athar (4466)
Then what should it return, according to you?
If there are no accounts, it goes without saying that it will return zero.
Auris (9)
Well accounts are declared and initialized in main, then added to AccountList. So according to me they are there...

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#include <iostream>
//#include "Account.h"
//#include "AccountList.h"
#include "bank.h"

int main (int argc, const char * argv[])
{
    AccountList al1 = AccountList();
    Account a1 = Account(65,100);
    Account a2 = Account(130,200);
    Account a3 = Account(260,150);
    
    Bank b1 = Bank();
    
    al1.add(a1);
    al1.add(a2);
    al1.add(a3);
    al1.println();

    cout<<a1.get_balance()<<endl;
    cout<<b1.total_balance()<<endl;

    return 0;
    
}


here's what it prints out:

AccountList[(Account(65,100))(Account(130,200))(Account(260,150))]
100
0
fg109 (709)
Where do you add "all" to b1?
Athar (4466)
You're adding the accounts to al1, not to the bank...
Auris (9)
Alright! I see my mistake now. I had a silly assumption that since Bank contained AccountList, everything would be in the Bank too. But then why would I need add_account() in the Bank.. Thank you guys!
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