Filling 2d array using for loop

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Hi, I want to fill 2d array using for loop, I want to enter 9 rows in 2d array with 3 record in each row my code is something like this, I want test array should contain
9 rows with 3 elements in each row. In case of this code no new row has been added to the array rather first row is updated each time

C#

for (int i = 0; i < 9; ++i)
            {
                test[i] = 1;
                // arr[i] = [9]{1,2,3};
                //test[i]={1,2,3};
                for (j = 0; j < 2; ++j)
                {
                    int[][] test = new int[] { 1, 2, 3 };
                }
            }

Posted 7-Jan-13 17:36pm

rameshKumar1717

Updated 7-Jan-13 18:25pm

Rahul Rajat Singh

v4

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PIEBALDconsult 7-Jan-13 23:48pm

So what's the problem? And why are you unsure what your code is?

rameshKumar1717 7-Jan-13 23:54pm

i am not getting this can u suggest me code its not adding new row, only updating first row with new value instead of adding second one.

rameshKumar1717 8-Jan-13 0:32am

in above simple code, in my original code element of 2d array will be value of pixels in an image so finally my 2d array would contain 1024 rows with 9 element in each row. plz help me this is college assignment.

4 solutions

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Christian Graus · Answer 1 · 2013-01-07T18:07:00

Solution 1

You want to do two loops, nested.

C#

for(int i =0; i < 3; ++i)
{
for(int j =0; j < 3; ++j)
{
  // add items here
}
}

Posted 7-Jan-13 18:07pm

Christian Graus

Comments

ridoy 8-Jan-13 1:06am

+5

Santhosh Kumar Jayaraman · Answer 2 · 2013-01-07T18:53:00

check this

C#

 //declare new 2d array
 int[,] test=new int[9,3];

 for (int i = 0; i < 9; ++i)
 {
     for (int j = 0; j < 3; ++j)
     {

         //setting value for each element
         test[i, j] = 1;
     }
 }

//writing the elements in console window

 foreach (int i in test)
 {
    // MessageBox.Show(i.ToString());
     Console.WriteLine(i);
 }

Sandeep Mewara · Answer 3 · 2013-01-07T18:28:00

Solution 2

Other then using two for-loops, if you have a small 2-D array, you can do it at the time of defining array itself.
Example:

C#

string[,] arr = new string[,]
    {
        {"A", "F"},
        {"B", "G"},
        {"C", "H"},
        {"D", "I"},
        {"E", "J"}
    };

Refer: 2D Array[^]

Posted 7-Jan-13 18:28pm

Sandeep Mewara

Vishal.Shimpi144 · Answer 4 · 2013-01-07T19:09:00

Solution 4

for(i=0 ; i<now_of_rows; i++ )
{
  for(j=0 ; j<now_of_cols ; j++)
  {
    arr[i][j] = //assign your value here
  }
}

Posted 7-Jan-13 19:09pm

Vishal.Shimpi144

Updated 7-Jan-13 19:11pm

v2