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Question

How to print an a 4x4 array in clockwise direction using C#

Answer 1

+3 A:

Do you have any specific technique that you are supposed to use for this exercise? Otherwise you can just write code that does that:

Console.WriteLine(theArray[0,0]);
Console.WriteLine(theArray[1,0]);
Console.WriteLine(theArray[2,0]);
Console.WriteLine(theArray[3,0]);
Console.WriteLine(theArray[3,1]);
Console.WriteLine(theArray[3,2]);
Console.WriteLine(theArray[3,3]);
Console.WriteLine(theArray[2,3]);
Console.WriteLine(theArray[1,3]);
Console.WriteLine(theArray[0,3]);
Console.WriteLine(theArray[0,2]);
Console.WriteLine(theArray[0,1]);
Console.WriteLine(theArray[1,1]);
Console.WriteLine(theArray[2,1]);
Console.WriteLine(theArray[2,2]);
Console.WriteLine(theArray[1,2]);

Guffa 2010-07-25 03:26:57

I wonder why this answer has 6 votes? Obviously the question requires a technique. Anyone could do it with 200 WriteLines!!!

bits 2010-07-25 06:05:28

@bits: Perhaps because it's the simplest and most straight forward solution. (Oh, and you don't need 200 lines to print a 4x4 array, you only need 16 lines.)

Guffa 2010-07-25 08:18:15

_At least_ do it in a loop over the respective coordinates.

Svante 2010-07-25 12:09:07

@Svante: There are plenty of ways to complicate the code, but the purpose was to show the simplest way.

Guffa 2010-07-25 13:29:16

The idea must have been NxM array. 4x4 was just a trivial example. Anyone should understand that much.

bits 2010-07-25 13:53:45

@bits: You are assuming that it has to be more complicated than what the OP asked for. It might be so, but it might as well be just as simple as it seems. I answered the actual question, you may interpret it as a more complicated question if you like, and answer that.

Guffa 2010-07-25 16:09:16

@bits, I think it's a safe assumption that the matrix is square.

Blindy 2010-07-25 17:41:50

I just can't believe how can you guys assume that its going to be a square and that too 4x4. What the questioner gave was just a trivial example. Well, anyway the question is closed. No point in arguing here.

bits 2010-07-25 17:48:45

@bits: Because the OP explicitly **said so**. You can assume that the OP doesn't mean what he said, but that seems more far fetched than assuming that he does.

Guffa 2010-07-25 20:14:21

I am trying to be polite here, but I find the mindset that sees rolling this into a loop as "complication" inappropriate for a programmer.

Svante 2010-07-26 09:49:28

@Svante: You failed.

Guffa 2010-07-26 20:46:05

Answer 2

+3 A:

Here's my stab at it:

    static void Spiral(int[,] m)
    {
        int n = m.GetUpperBound(0);
        for (int i = 0; i < n / 2; ++i)
        {
            for (int j = i; j <= n - i; ++j)
                Console.Write(m[i, j] + " ");
            for (int j = i + 1; j <= n - i; ++j)
                Console.Write(m[j, n - i] + " ");
            for (int j = i + 1; j <= n - i; ++j)
                Console.Write(m[n - i, n - j] + " ");
            for (int j = i + 1; j < n - i; ++j)
                Console.Write(m[n - j, i] + " ");
        }

        Console.Write(m[n / 2, n / 2]+" ");
        if (n % 2 == 1)
        {
            Console.Write(m[n / 2, n / 2+1] + " ");
            Console.Write(m[n / 2+1, n / 2+1] + " ");
            Console.Write(m[n / 2+1, n / 2] + " ");
        }
    }

    static void Main(string[] args)
    {
        int[,] myArray = new int[,]{
            {11, 12, 13, 14, 15},
            {21, 22, 23, 24, 25},
            {31, 32, 33, 34, 35},
            {41, 42, 43, 44, 45},
            {51, 52, 53, 54, 55}
        };
        Spiral(myArray);
    }

The output is:

11 12 13 14 15 25 35 45 55 54 53 52 51 41 31 21 22 23 24 34 44 43 42 32 33

edit: Works for both even and odd sized square matrices now.

Blindy 2010-07-25 03:58:27

Thanks it works.

Pritam Karmakar 2010-07-25 07:20:22

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How to print an a 4x4 array in clockwise direction using C#

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