How to return multiple values from a method?

Question

From the following code, I want y to return multiple values, but the program returns only the last one.

public int runDraw()
{
    for (int j = 1; j <= numberofDraws; j++)
    {
        ...
        if (even_count > odd_count)
        {
            Console.WriteLine("The result of {0} draw is Even.", j);
            y = 1;
        }
        else if (even_count < odd_count)
        {
            Console.WriteLine("The result of {0} draw is Odd.", j);
            y = 2;
        }
        else
        {
            Console.WriteLine("The result of {0} draw is Draw.", j);
            y = 3;
        }
    }
    return y;
}

y can only hold a single value at a time. The fact that you reset it in a loop doesnt change that and it only returns after the entire loop has run — Ňɏssa Pøngjǣrdenlarp
– Ňɏssa Pøngjǣrdenlarp, Commented Aug 16, 2020 at 18:04

defines · Accepted Answer · 2020-08-16 18:12:57Z

One option would be to return an enumeration of int, as a single int cannot represent multiple values directly. Here's an example using yield return which will only bother continuing to the next value if you ever ask for it.

    public IEnumerable<int> runDraw()
    {
        for (int j = 1; j <= numberofDraws; j++)
        {
        ...
            if (even_count > odd_count)
            {
                Console.WriteLine("The result of {0} draw is Even.", j);
                yield return 1;
            }
            else if (even_count < odd_count)
            {
                Console.WriteLine("The result of {0} draw is Odd.", j);
                yield return 2;
            }
            else
            {
                Console.WriteLine("The result of {0} draw is Draw.", j);
                yield return 3;
            }
        }
        yield return y;
        // What you do here really depends on your unshared logic
        // You might return 0 or throw an exception if this is invalid
    }

You can then access the values iteratively, for example with a foreach loop:

foreach (int j in runDraw())
{
    Console.WriteLine(j);
}

Jitendra · Accepted Answer · 2020-08-16 18:26:49Z

1

you can achieve this via array or collection.

Using array

 int[] result = new int[numberofDraws];
 result[j] = your result (1,2,3 based on condition)
 return result;

Using List

 List<int> result = new List<int>();
 result.Add(1);
 return result;

Note: Change the return type as per usage in case you are going with an array use int[], if you are going with list use List<int>.

answered Aug 16, 2020 at 18:26

Jitendra

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Comments

doguyildizhannn · Accepted Answer · 2020-08-16 22:01:06Z

0

You can use out parameters or tuples for returning multiple values from any function, check for them.

answered Aug 16, 2020 at 22:01

doguyildizhannn

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