Inheritance Questions

Question

Normally Inheritance is supposed to let the derived class have the base classes protected and public variables.

#include <iostream> #include <vector> #include <string> using namespace std; ////ACCOUNT////// class Account { protected: string name; int balance; public: Account(string n) : name{n} { cout << name << endl; } }; ////SAVINGS////// class Savings: public Account { Savings(string s): name{s} { cout << "WTFA@A@" << endl; } }; int main() { Account wtf ("wth"); Savings test ("EEE"); return 0; }

Why does that code give me an error? Should Savings have inherited the name variable from Account?

Furthermore, if I wanted to add a deposit and withdraw function to both Account and Savings, do I have to add it individually or does inheritance help with that? The Withdraw is the same for both, but the Deposit is slightly different because Savings will have an interest rate.

Hi, what is the error you are getting?

Bart Friederichs
– Bart Friederichs

2019-02-25 19:48:15 +00:00
Commented Feb 25, 2019 at 19:48 — Bart Friederichs
– Bart Friederichs, Commented Feb 25, 2019 at 19:48

Bart Friederichs · Accepted Answer · 2019-02-26 11:10:37Z

2

Two things:

First, if you want to call the superclass' constructor, do this:

Savings(string s): Account(s) { ... }

Second, you forgot to make the subclass' constructor public. Methods in classes are private by default in C++.

edited Feb 26, 2019 at 11:10

answered Feb 25, 2019 at 19:54

Bart Friederichs

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5 Comments

Jesper Juhl Over a year ago

"Methods are private by default in C++" - in classes, yes. In structs the default is public.

463035818_is_not_an_ai Over a year ago

...and structs are also classes ;)

463035818_is_not_an_ai Over a year ago

@JesperJuhl I know what you meant, I was rather refering to Bart using the term "classes" as if structs are no classes.

Bart Friederichs Over a year ago

@user463035818 how to rephrase that then?

463035818_is_not_an_ai Over a year ago

not sure, maybe "Methods in classes declared via class are private by default (public in classes declared with the keyword struct)".

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