Question

in C# console app, how do you put the first digit of split string into two dimensional array?

string[,] table3x3 = new string[3, 3];  
string myString = "11A23A4A5A87A5"; 
string[] splitA = myString.Split(new char[] { 'A' });

Let’s say I have 2-dimensional array of 3×3 and a string with numbers and a vowel. I split them so that I can put them inside the 2Darray. What kind of loop should I include so that the output would be

Console.WriteLine(table3x3[0, 0]); //output: blank
Console.WriteLine(table3x3[0, 1]); //output: blank
Console.WriteLine(table3x3[0, 2]); //output: 2
Console.WriteLine(table3x3[1, 0]); //output: blank
Console.WriteLine(table3x3[1, 1]); //output: 4
Console.WriteLine(table3x3[1, 2]); //output: 5
Console.WriteLine(table3x3[2, 0]); //output: 8
Console.WriteLine(table3x3[2, 1]); //output: blank
Console.WriteLine(table3x3[2, 2]); //output: 5

Visually, the output would be like:

[ ][ ][2]
[ ][4][5]
[8][ ][5]

There are 9 numbers and 5 vowels inside the string. It returns the first digit of split string into specific 2Darray according to their sequences.

Answer 1

This should do it:

string[,] table3x3 = new string[3, 3];  
string myString = "11A23A4A5A87A5";

int stringIndex = -1;
bool immediatelyFollowsA = false;
for (int row = 0; row < 3; row++)
    for (int col = 0; col < 3; col++)
    {
        while (myString[++stringIndex] == 'A')
        {
            immediatelyFollowsA = true;
        }

        if (immediatelyFollowsA)
        {
            table3x3[row,col] = myString[stringIndex].ToString();
            immediatelyFollowsA = false;
        }
    }

Demo: http://ideone.com/X0LdF

---

Or alternatively, adding to your original starting point:

string[,] table3x3 = new string[3, 3];  
string myString = "11A23A4A5A87A5";
string[] splitA = myString.Split(new char[] { 'A' });

int index = 0;
bool first = true;
foreach (string part in splitA)
{
    int row = index / 3;
    int col = index % 3;

    if (!first)
    {
        table3x3[row, col] = part[0].ToString();
    }

    index += part.Length;
    first = false;
}

Demo: http://ideone.com/7sKuR