Help with arrays

Here is what I want to do

I making a class and in each class there is an array. Each class is going to has the array be a different size so what I tried to do is this

int matrix = new array();

//constructor
matrices(int m, int n)
{
matrix[m][n]
}

what i realized later down the road is that there is no new array and that when saying matrix[m][n] i'm refering to a value in the array. So how would I create an array in a class where it is a different size in different objects of the class

You need to declare a pointer to the array in the class, and then use dynamic allocation to give each class its own aray. Search Google or this forum for the process of dynamically allocating a two-dimensional array (it's trickier than you'd think).