Return two variables in c++

Question

2.50/5 (2 votes)

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There is any way we can return two variables in a function. In the following function I would like to return result and counter. Can anyone help me please?

C#

int repetition(int array3[])
{
    int copy[100];

    int result = 0;
    int number;
    for (int i = 0; i<100; i++)
    {

        copy[i]=array3[i];
    }

    for (int i = 0; i < 100; i++)
    {
        int counter = 0;
        for (int j = 0; j < 100 ; j++)
        {
            if (array3[i] == copy[j])
            {
                counter++;
            }
            if (counter > result )
            {
                result = counter;
                number = array3[i];
            }
        }

    }

return result, number;

}

Posted 10-May-14 15:41pm

Alexander24

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2 solutions

Solution 2

There are some options. Solution 1 is one of them. A similar solution is to return an array with two elements. These two solutions are not very clean, because they are not sound in terms of semantics of the two values returned. In some (more or less rare cases) this is what's needed.

If the values carry distinct semantics, you should better use clearer approach: create a structure or a class with two instance member of required types and return the instance of this type.

Also, let's consider the way beyond return. Alternatively, you can pass a parameter by reference. If you change the parameter value, it will be modified on output. Please see: http://www.learncpp.com/cpp-tutorial/73-passing-arguments-by-reference[^].

And a final, side note: many developers do a great code design mistake: returning some status or error code from functions. This approach is badly obsolete and bad. With C++ and most modern languages, you shouldn't return anything like that but should throw an exception.

—SA

Posted 10-May-14 18:40pm

Sergey Alexandrovich Kryukov

Updated 11-May-14 4:16am

v2

Comments

chandanadhikari 11-May-14 4:52am

5 for the link and the explanation and all!

Sergey Alexandrovich Kryukov 11-May-14 10:14am

Thank you very much.
—SA

Maciej Los 11-May-14 10:39am

Valueable answer. I have no idea why it has been downvoted.

Sergey Alexandrovich Kryukov 11-May-14 14:48pm

Thank you, Maciej.
Here we go again. Someone with highest score (-16 in down-votes) down-votes several answers in a row, during few days. Such attacks happen from time to time. Looks like "emotional voting" to me...
—SA

Maciej Los 11-May-14 15:43pm

Sometimes it happens to me too... ;(
I do not understand such behaviour and do not accept it. In my opinion, it's a matter of honor. I'm not afraid to down-vote someones answer. But i'm not doing it anonymous.

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Sayan Bera · Accepted Answer · 2014-05-10T15:53:00

Solution 1

XML

std::pair<int, int> repetition(int array3[])
{
   // :
   return std::make_pair(result, number);
}

std::pair<int, int> answer = repetition(arr);
std::cout << answer.first << ", " << answer.second << std::endl;

Posted 10-May-14 15:53pm

Sayan Bera

Updated 10-May-14 16:20pm

v2

Comments

Sergey Alexandrovich Kryukov 11-May-14 0:33am

This is just one of the ways. Voted 4.
Please see Solution 2 for more comprehensive answer.
—SA

Maciej Los 11-May-14 10:41am

+5