Thread: Accessing Arrays

Or else just use extern.

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()?