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How to exchange data between classes?

I am learning C ++ and moving my project from C to C ++. In this process, I came across this problem: how to save / update variables that are used in several classes? In C, I used global variables, but this is not good for C ++.

So, suppose we have 4 classes:

class Main_Window
{
    //...
    void load_data_menu_selected();
}

class Data
{
    //...
    double *data;
}

class Load_Data
{
    //...
    double *get_filename_and_load();
}

class Calculate
{
    //...
    int do_calculation()
}

So, Main_Window is the class for the main application window, where it interacts with user input, etc.
I want to do:

create an instance of the Data class in Main_Window use Load_Data to load data from a file and save it to Data li> use the calculation class to do something with the read data in the data class

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{
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 DataObject windowData;

 public:
 void loadData(string fileName);
 void calculate();
}

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