Pointers pointing to array of objects

hey people, this is my first post, I have a problem that stumped me, this is the scenario:

I have 2 classes, class A and class B. Class A contains all the variables, getters, and setters. In class B, I need to create a pointer that points to an array of Object of class A.

Can some one help me in this?

Like

Or have you already tried that (or something similar), and have some error messages to share with us?

class A{
public:
int a;

A(){
a=0;
}

int getA()
{
return a;
}

void setA(int z)
{
a=z;
}
};


class B{
public:
A *ptr;
A *array[3];
static int count;

B ()
{

contruc();
*ptr= array[];
count=0;
}

void contruc ()
{
for (int i=0; i<=2; i++)
array[i]= new A();
}
void insert()
{

}

void show()
{

}
};

void main ()
{
B b1;

}
there is an error which I can't manage to figure out...

Please use code tags to post code ([code]Your code here[/code]). Also, it's better to state the problem explicitly than to say "there is a problem" and expect us to find it.

I can't tell what the intended purposes of the variables ptr, array, and the function contruc() are, or what you mean by the line *ptr = array[];. Could you explain it in words?

sorry about that... let me be a little bit more specific:
First I have a class:



Now the problem is that I have to create another class call class B which contains a pointer, lets call it ptr, which is used to point to an array of A object, and a integer counter, which is used to store the number of existing As currently. I need to have a constructor to create an array for the pointer.

Now normally it is not too difficult in Java, but I am not strong in C... so any help is appreciated..

> lets call it ptr, which is used to point to an array of A object,
Given
A *ptr;
A *array[3];
A valid assignment would be
ptr = array[0];

But since you only did
array[ i ]= new A();
ptr is only pointing at ONE A

Now if you did
array[ i ]= new A[10]; // create 10 of them,

Then
ptr = array[0];
would indeed be a pointer to an array of A's

Remember that array itself is an array of pointers to A.

> void main ()
main returns an int.

Thanks for the reply...


now this is weird, I am possitively sure that I should use:



since this would in fact create and array of A objects of size i. I will try out your suggestion anyway



I need the pointer to point the the array, this method seems only to point to the first object in the array: array[0]; How would I then access to the other objects in the array?

> since this would in fact create and array of A objects of size i.
But i is on the left of the expression, not the right.

If you have
array[ i ]= new A[10]; // create 10 of them,
ptr = array[0];

Then ptr[0] is array[0][0] and ptr[9] is array[0][9]

In other words, ptr is just an alias for what you've stored in array[ i ]

Ah... I get it now... I am new to C++, thanks for your help... many thanks