Overloading a virtual function in a child class

Question

I am just testing with virtual keyword and inheritance concepts in c++. I have written a small program:

#include
#include

us         


        

Answer 1

It's because the print function in the child class takes a parameter and the original doesn't.

in cna_MO (parent class):

virtual void print()

in cna_bsc (child class):

void print(int a)

Basically the child's print should not take an int argument:

void print()

EDIT:

Maybe the best would be to make passing the int optional ?

eg:

in cna_MO (parent class):

virtual void print(int a=-1) {
    if (a == -1) {
        // Do something for default param
    } else {
        cout << a;
    }
}

in cna_bsc (child class):

void print(int a=-1)

so if a == -1 you can probably assume, they didn't pass anything.

The trick is that both the parent and child need the same method siganture, meaning same return type and the same argument types.