passing arrays between functions c++

Question

I have looked around, and can't find anywhere that explicitly answers how to pass an array from function1, class1 to function2, class2.

This is my code.

Game Class

void Game::userInputNumbers()
{
    for (int i = 0; i < 6; i++)
    {
    std::cin >> myNumbers[i];
    }

    for (int i = 0; i < 6; i++)
    {
        std::cout << myNumbers[i] << "   ";
    }
}

Main

game.userInputNumbers(); 
user.setTicket(int a, myNumbers[6], username);

User Class

void User::setTicket(int i, int myNumbers[6], std::string username)
{
    std::ofstream fout (username + "Ticket" + a + ".txt");

    for (int i = 0; i < 6; i++)
    {
    fout << myNumbers[i] << std::endl;
    }
}

I'm aware that I will probably have to declare the array as static (not really sure how, or what the implications of that are) and that I will have to use pointers in some form.

Also please note, username and int a have been declared elsewhere in the program and work for other functions so I'm not worried about those, and I have left out all unnecessary code such as my includes as again the rest of the program compiles fine

Thanks in advance

Function call in the main method should be this way user.setTicket(a, myNumbers, username); . Isn't it? — Tun Zarni Kyaw
– Tun Zarni Kyaw, Commented Dec 9, 2013 at 9:33
Either use pointer + count of elements OR (much better) use a std::vector. — Marius
– Marius, Commented Dec 9, 2013 at 9:34
can i manipulate a vector in a similar way to an array, or is it styled more like a linked list? — user3001499
– user3001499, Commented Dec 9, 2013 at 9:36

dutt · Accepted Answer · 2013-12-09 09:38:13Z

3

I suggest using std::vector instead of a normal array.

There are a couple of ways you can do this, one is something like this:

gameObject.userInputNumbers();
userObject.setTicket(value, gameObject.getMyNumbers(), username);

answered Dec 9, 2013 at 9:38

dutt

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1 Comment

user3001499 Over a year ago

this worked thanks, will research into vectors thanks for the tip

Ray · Accepted Answer · 2013-12-09 09:37:09Z

1

You can't declare a here:

user.setTicket(int a, myNumbers[6], username);

Instead, use:

user.setTicket(a, myNumbers[6], username);

Also, when passing an array, you don't need to include the array length:

user.setTicket(a, myNumbers, username);

answered Dec 9, 2013 at 9:37

Ray

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Comments

Mike · Accepted Answer · 2013-12-09 09:42:33Z

0

Examples found here http://www.cplusplus.com/doc/tutorial/arrays/

for your case this is how you would do it:

// arrays as parameters
#include <iostream>
using namespace std;

void SetArray (int& arg[]) {
  for (int i=0; i<arg.size(); ++i)
    cin >> arg[i];
}

int main ()
{
  int myNumbers[6];
  SetArray(myNumbers);
}

edited Dec 9, 2013 at 9:42

answered Dec 9, 2013 at 9:37

Mike

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