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Thnk you all!

what is wrong in this code? when i compile i get the following error:
Error 'newcoordinate':undeclared identifier


#include "stdafx.h"
#include <iostream>
using std::cout;
using std::cin;...

what are stacks? For what are they good? when should i use them and how are they implemented?

Thank you so much!!!!!!!

Are struct and class the same or they differ in essence and in implementation? Why did you prefer to use struct for Input?

Thank you very much indeed. I prefer this approach as you said for the sake of learning only.

That was my idea. But as I mentioned earlier I am starting from scratch. I have read and am reading yet how to do that. But i could not get any workable (implementation) code. e.g.

Class Input
...

I (beginner) am trying to program a simple calculator that accepts two numbers (float) and can add, subtract, multiply and divide.

I want to realise this “project” using at least 3 classes....