passing 2D array to another class C++ - c++

Question

I am trying to calculate the perimeter of a rectangle. first I will prompt the user 4 times for the X and Y cords and store it into a 2D array and pass this 2D array to another class which is method class to proceed with the calculation of the perimeter. But the problem is, I don't know how to pass the 2d array to method class.
I am not asking how to calculate the perimeter, I only need to know how to pass the 2D array from main to method class and get the 2D array at method class.
Please advise.
main.cpp
Method method;
int main() {
int storeXandY[4][2];
for(int i=1;i<5;i++)
{
cout << "Please enter x-ordinate" << i<< endl;
cin>>storeXandY[i][0];
cout << "Please enter y-ordinate" << i << endl;
cin>>storeXandY[i][1];
}
//how to pass the 2D array to method class to do some calculations?
// I was thinking something like passing the 2d array to a consturctor but don't know whether it can be done
method.constructor(storeXandY);
}
method.h
//not sure of what to do
public:
constructor() {
}
method.cpp
//how to get the cords from 2d array from main
Please advise. Thanks

Answer 1

You can do it as :
class Method{
...
public int calcPerimeter(int vals[4][2])
{
// do your calculation here using vals array
}
...
}
From main(), you can simply do :
Method m = new Method();
int perimeter;
m.calcPerimeter(<your_array_name>);

Answer 2

Since you are writing C++, you should try to avoid using C-style arrays. I would do this
Method method;
int main() {
vector<vector<int> > storeXandY(4);
for(int i=0; i!=4; ++i) storeXandY[i].resize(2);
for(int i=1;i<5;i++)
{
cout << "Please enter x-ordinate" << i<< endl;
cin>>storeXandY[i-1][0]; /* you need i-1 here, not i */
cout << "Please enter y-ordinate" << i << endl;
cin>>storeXandY[i-1][1];
}
method.calcPerimeter(storeXandY);
}
where method::calcPerimeter is declared as follows
your_return_type method::calcPerimeter(const vector<vector<int> >& rectangle);
The advantage of using vectors is that you can get the number of elements they hold by invoking their size member function, so that in the above code storeXandY.size() is equal to 4 and storeXandY[0].size() is equal to 2.