C++ exercise with virtual functions

[nikos91able]

My main function is this:
int main(int argc, char* argv[])
{
int l1, n;
Ball** ball;

l1=atoi(argv[1]);
n=atoi (argv[2]);

for(int i=0; i<n; i++)
ball[i] = new Basket(l1);

delete[] ball;
}

I have four classes:
class Ball{
public:
Ball() {}
virtual ~Ball() {}
virtual void hit() {...}
};

class Basket{
int d;
public:
Basket(int i) { d=i; cout << "I create a basket-ball.." << endl; }
~Basket() { cout << "A ball destroyed..." << endl; }
};

class Tennis{ /* similar with Basket*/ };
class Ping_pong{};

I want to create an array of objects that I could control their info, and with this code I take this:
I create a basket-ball
Segmentation fault

I'm new in programming..Please help..

[kbw]

I want to create an array of objects that I could control their info, and with this code I take this:
I create a basket-ball

Your Basket Ball would be a special kind of ball, so your declarations become:

class Ball
{
public:
    Ball() {}
    virtual ~Ball() {}
    virtual void hit() {...}
};

class Basket : public Ball
{
    int d;
public:
    Basket(int i) { d=i; cout << "I create a basket-ball.." << endl; }
    ~Basket() { cout << "A ball destroyed..." << endl; }
};

To complete your example:

int main(int argc, char* argv[])
{
    if (argc < 3)
        return -1;
    int l1=atoi(argv[1]);
    int n=atoi(argv[2]);

    // create ball container
    Ball** ball = new Ball*[n]

    // create balls
    for(int i=0; i<n; ++i)
        ball[i] = new Basket(l1);

    // hit balls
    for(int i=0; i<n; ++i)
        ball[i]->hit();

    // delete balls
    for(int i=0; i<n; ++i)
        delete ball[i];

    // delete ball container
    delete [] ball;
}

[MikeyBoy]

1) Please use code tags when posting code, to make it readable:

http://www.cplusplus.com/articles/z13hAqkS/

2) You're trying to use Basket as if it inherited from Ball. However, in your definition of Basket, it doesn't inherit from anything!

EDIT: Ninja'd by kbw.

[nikos91able]

MikeyBoy 1) I'm new in the forum....I will certainly apply what you said

2) My mistake...I forget to write it in the question.

kbw Thank you for your useful points..