Accessing Arrays

Hi

I have functions within a .ccp file named "menus.cpp", which access an array, which is defined at the top of this .cpp file.
All the functions work fine at the moment, but I need to split this big "menus.cpp" file up into smaller classes.

If I move the array to the top of the "main.cpp" file where I will call the functions from the "menus.cpp" file - how do I allow different classes to access the array in the "main.cpp" file...?

Cheers

PK

How about passing the array as a parameter rather than relying on some global variable kludge?

Or else just use extern.

I hate to do this to your guys n gals, but...
... could you please explain further please?
(Both Salem's and dwks's methods... I am googling both after submitting this )

CHeers

PK

You can declare a global variable in one file and declare it in another the same way except with extern at the beginning. Or you can pass the variable to the functions that need it, as Salem suggested, which is a much better idea.

What needs more explaining? Okay, here's an example.

Code:

/* main.c */
#include <iostream>

int two;

void what(int two);

int main(void) {
    int one;

    one = 3, two = 6561;

    return 0;
}

Code:

/* other.c */
#include <iostream>

extern int one;

void what(int two) {
    std::cout << "one = " << one << "\ntwo = " << two << std::endl;
}

I hate to do this to your guys n gals, but...
... could you please explain further please?

Code:

#include <iostream>
using namespace std;
      
void someFunc(int data[], int size)  //can be in a separate .cpp file
{
    for(int i=0; i<size; i++)
    {
        cout<<data[i]<<endl;
    }
}

int main()
{
    int numbers[] = {10, 20, 30};
    someFunc(numbers, 3);
    
        
    system("PAUSE");
    return 0;
}

If you use a <vector> instead of an array, you won't have to pass the size around:

Code:

#include <iostream>
#include <vector>
using namespace std;
      
void someFunc(vector<int> data)  
{
    for(int i=0; i<data.size(); i++)
    {
        cout<<data[i]<<endl;
    }
}

int main()
{
    vector<int> numbers;
    numbers.push_back(10);
    numbers.push_back(20);
    numbers.push_back(30);
    
    someFunc(numbers);
    
            
    system("PAUSE");
    return 0;
}

Don't you need <cstdlib> for system()?

You SHOULD need it, but some compilers will let you get away with it.