Setters and getters across multiple classes? CPP - c++

Question

I'm having some trouble on my homework trying to figure out how I can use a setter function from my base class in a derived class. I'm not sure if I worded that correctly as I'm new to C++, but hopefully my code can explain it better!
class account{
private:
double balance;
protected:
int numwithdraws = 0;
public:
void Setbalance(int bal)
{
balance = bal + balance;
}
int Getbalance()
{
return balance;
}
};
class checking : public account {
public:
WriteCheck(int checknum,double amount)
{
cout<<"Check amount?"<<endl;
cin>>amount;
Setbalance(amount);
checknum++;
}
};
Inside my main function there's an option to make a withdrawal, usually that would mean my balance would go down so I'd have to figure out how to make this negative in my setbalance later, but
checking obj2;
obj2.WriteCheck(0,0);
cout<<"New Balance = "<<obj1.Getbalance()<<endl;
I took out a lot my code to narrow down where the problem point is, but I'll try to explain it better in words if what I wrote down for my code is confusing.
What I have in my base class account are a Setbalance and a Getbalance. In my derived class checking I'm trying to use the Setbalance function that's in my base class in my derived class function WriteCheck to change the amount of my private variable balance which is in my account base class.
The problem is when I use the Setbalance in my derived class function and call my Getbalance in main, it still ends up 0 and doesn't change the amount in variable balance.
I'm getting confused reading my own explanation, so I understand if it's hard to grasp what I'm trying to ask. If that's the case, please let me know so that I can try and explain further!

Answer 1

You're on the right track with what you're trying to achieve (calling a function in the base class from within the derived class). A derived class will generally have the functions that the base class has, so calling
checking obj2;
obj2.Getbalance()
Is perfectly fine. I made some syntax changes to your code so it can run. The only major change I made was set balance to 0 so there wouldn't be any undefined behavior.
#include <iostream>
using namespace std;
class account {
private:
double balance = 0;
protected:
int numwithdraws = 0;
public:
void Setbalance(int bal)
{
balance = bal + balance;
}
int Getbalance()
{
return balance;
}
};
class checking : public account
{
public:
void WriteCheck(int checknum, double amount)
{
cout << "Check amount?" << endl;
cin >> amount;
Setbalance(amount);
checknum++;
}
};
int main()
{
checking obj2;
cout << "New Balance = " << obj2.Getbalance() << endl;
return 0;
}