Converting index of one dimensional array into two dimensional array i. e. row and column

Question

I have one application of WinForms which inside list box I am inserting name and price..name and price are stored in two dimensional array respectively. Now whe

Answer 1

While I didn't fully understand the exact scenario, the common way to translate between 1D and 2D coordinates is:

From 2D to 1D:

index = x + (y * width)

or

index = y + (x * height)

depending on whether you read from left to right or top to bottom.

From 1D to 2D:

x = index % width
y = index / width 

or

x = index / height
y = index % height

Answer 2

Well, if I understand you correctly, in your case, obviously the index of the ListBox entry's array entry is the index in the ListBox. The name and price are then at index 0 and index 1 of that array element.

Example:

string[][] namesAndPrices = ...;

// To fill the list with entries like "Name: 123.45"
foreach (string[] nameAndPrice in namesAndPrices)
   listBox1.Items.Add(String.Format("{0}: {1}", nameAndPrice[0], nameAndPrice[1]));

// To get the array and the name and price, it's enough to use the index
string[] selectedArray = namesAndPrices[listBox1.SelectedIndex];
string theName = selectedArray[0];
string thePrice = selectedArray[1];

If you have an array like that:

string[] namesAndPrices = new string[] { "Hello", "123", "World", "234" };

Things are different. In that case, the indices are

int indexOfName = listBox1.SelectedIndex * 2;
int indexOfPrice = listBox1.SelectedIndex * 2 + 1;

Answer 3

For converting 1D indices to and from 3D indices:

(int, int, int) OneToThree(i, dx, dy int) {
    z = i / (dx * dy)
    i = i % (dx * dy)
    y = i / dx
    x = i % dx
    return x, y, z
}

int ThreeToOne(x, y, z, dx, dy int) {
    return x + y*dx + z*dx*dy
}

Answer 4

Try this,

int i = OneDimensionIndex%NbColumn
int j = OneDimensionIndex/NbRow //Care here you have to take the integer part