The error messages you're seeing are due to a few issues in your C++ code:

1. In your `dvd` class constructor, you're missing a closing parenthesis. It should look like this: `dvd(String id,int days) : Item(id,days){}`.

2. You're trying to create an instance of `dvd` with two arguments (`did` and `dd`), but your `dvd` class doesn't have a constructor that takes two arguments. You need to define a constructor in your `dvd` class that takes two arguments.

3. The variable `m` is not declared in your `main` function. You need to declare it before you can use it.

Here's how you can fix these issues:

```cpp
class dvd : public Item {
public:
dvd(String id, int days) : Item(id, days) {} // Fix the constructor
};

int main() {
String did = "some id";
int dd = 5;
dvd d(did, dd); // Now this line will work

// Declare m before using it
// Assuming m is another instance of dvd or a class that has a calculatefees() method
dvd m("another id", 7);
d.calculatefees() + m.calculatefees();
}
```

Please replace `"some id"` and `"another id"` with actual ids and `5` and `7` with actual number of days. Also, make sure that `Item` class has a constructor that takes two arguments (id and days) and `calculatefees()` method is implemented in `Item` or `dvd` class.

Question

The error messages you're seeing are due to a few issues in your C++ code:

1. In your `dvd` class constructor, you're missing a closing parenthesis. It should look like this: `dvd(String id,int days) : Item(id,days){}`.

2. You're trying to create an instance of `dvd` with two arguments (`did` and `dd`), but your `dvd` class doesn't have a constructor that takes two arguments. You need to define a constructor in your `dvd` class that takes two arguments.

3. The variable `m` is not declared in your `main` function. You need to declare it before you can use it.

Here's how you can fix these issues:

```cpp
class dvd : public Item {
public:
    dvd(String id, int days) : Item(id, days) {} // Fix the constructor
};

int main() {
    String did = "some id";
    int dd = 5;
    dvd d(did, dd); // Now this line will work

// Declare m before using it
    // Assuming m is another instance of dvd or a class that has a calculatefees() method
    dvd m("another id", 7);
    d.calculatefees() + m.calculatefees();
}
```

Please replace `"some id"` and `"another id"` with actual ids and `5` and `7` with actual number of days. Also, make sure that `Item` class has a constructor that takes two arguments (id and days) and `calculatefees()` method is implemented in `Item` or `dvd` class.

Knowee AI · Accepted Answer

The error messages you're seeing are due to a few issues in your C++ code:

1. In your `dvd` class constructor, you're missing a closing parenthesis. It should look like this: `dvd(String id,int days) : Item(id,days){}`.

2. You're trying to create an instance of `dvd` with two arguments (`did` and `dd`), but your `dvd` class doesn't have a constructor that takes two arguments. You need to define a constructor in your `dvd` class that takes two arguments.

3. The variable `m` is not declared in your `main` function. You need to declare it before you can use it.

Here's how you can fix these issues:

```cpp
class dvd : public Item {
public:
    dvd(String id, int days) : Item(id, days) {} // Fix the constructor
};

int main() {
    String did = "some id";
    int dd = 5;
    dvd d(did, dd); // Now this line will work

// Declare m before using it
    // Assuming m is another instance of dvd or a class that has a calculatefees() method
    dvd m("another id", 7);
    d.calculatefees() + m.calculatefees();
}
```

Please replace `"some id"` and `"another id"` with actual ids and `5` and `7` with actual number of days. Also, make sure that `Item` class has a constructor that takes two arguments (id and days) and `calculatefees()` method is implemented in `Item` or `dvd` class.

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