CODEWITHSUNDEEP
c++
Vagner
Vagner

Reputation: 13

error: invalid use of ‘class Animal::animalSound’

could you please help me? I have a question about virtual functions. I'm having a hard time getting this code to work. Could someone help me please? I can't get the attributes of the dog or cat to be printed at the end of the program. This is the error code: error: invalid use of ‘class Animal::soundDuringFeeding’ error: invalid use of ‘class Animal::animalSound’

#include <iostream>
using namespace std;
class Animal
{
public:
    class soundDuringFeeding
    {
    public:
        virtual void eat() = 0;
    };

    class animalSound
    {
    public:
        virtual void meow() = 0;
        virtual void bark() = 0;
    };
};

class Dog : public Animal
{
public:

    void bark()
    {
        cout<<"Au Au Au"<<endl;
    }
    void eat()
    {
        cout<<"Chomp chomp"<<endl;
    }
};

class Cat : public Animal
{
public:
    void meow()
    {
        cout<< "Miau"<<endl;
    }
    void eat()
    {
        cout<<"Slurp"<<endl;
    }
};

int main()
{
    Animal *songs;

    int choose = 0;
    cout<<"Choose the animal: 1 - Dog | 2 - Cat"<<endl;
    cin>>choose;

    if(choose == 1)
    {
        songs = new Dog();
    }
    else if(choose == 2)
    {
        songs = new Cat();
    }
    songs->soundDuringFeeding;
    songs->animalSound;

    return 0;
}

Upvotes: 0

Views: 312

Answers (1)

Jakub D&#243;ka
Jakub D&#243;ka

Reputation: 2625

your structure and understanding of inheritance is little off, eather way you have to use it like this to achive common behavior:

#include <iostream>
using namespace std;
class Animal
{
public:
    
    public:
        virtual void eat() = 0;
        // method has to have more general name but mainly the same name, the 
        // nested class action you were doing there was far from right, its as if
        // you just tried random staff 
        virtual void makeSound() = 0;

};

class Dog : public Animal
{
public:
    // renamed
    void makeSound()
    {
        cout<<"Au Au Au"<<endl;
    }
    void eat()
    {
        cout<<"Chomp chomp"<<endl;
    }
};

class Cat : public Animal
{
public:
    // renamed
    void makeSound()
    {
        cout<< "Miau"<<endl;
    }
    void eat()
    {
        cout<<"Slurp"<<endl;
    }
};

int main()
{
    Animal *a;

    int choose = 0;
    cout<<"Choose the animal: 1 - Dog | 2 - Cat"<<endl;
    cin>>choose;

    if(choose == 1)
    {
        a = new Dog();

    }
    else if(choose == 2)
    {
       a = new Cat();
    }

    // now you can call methods invoked with '()' syntax
    a->eat();
    a->makeSound();

    return 0;
}

i highli recomend entering inheritance cpp or virtual cpp to browser

Upvotes: 1

Related Questions