Answer to Exercise 6

Not so easy, this one! The key to it is to fill a multidimensional array. The array is set up on the first line, in the code below. You then use a double for loop to access each position in the array. The inner for loop is where the action is. You use modulus to check if a row variable can be divided by 2. If it can, you again use modulus to check the col variable. If col mod 2 gives you an answer of 1 then add "black" to that array position. If col mod 2 gives you an answer of 0 then fill the array position with the word "white". You do the opposite if the row variable can't be divided by 2.

```private void btnCheckerBoard_Click(object sender, EventArgs e)
{
string[,] checker = new string[9, 9];

for (int row = 1; row < 9; row++)
{
for (int col = 1; col < 9; col++)
{
if (row % 2 == 0)
{
if (col % 2 == 1)
{
checker[row, col] = "black";
}
else
{
checker[row, col] = "white";
}
}
else
{
if (col % 2 == 1)
{
checker[row, col] = "white";
}
else
{
checker[row, col] = "black";
}
}
}
}

//PRINT IT OUT
string temp = "";
for (int i = 1; i < 9; i++)
{
for (int j = 1; j < 9; j++)
{
temp = temp + checker[i, j] + "-";
}

temp = "";
}

}
```

```Private Sub btnChecker_Click(sender As Object, e As EventArgs) Handles btnChecker.Click

Dim checker(9, 9) As String
Dim row As Integer
Dim col As Integer

For row = 1 To 8
For col = 1 To 8
If row Mod 2 = 0 Then
If col Mod 2 = 1 Then
checker(row, col) = "black"
Else
checker(row, col) = "white"
End If
Else
If col Mod 2 = 1 Then
checker(row, col) = "white"
Else
checker(row, col) = "black"
End If
End If
Next
Next

'PRINT IT OUT
Dim temp As String = ""

For row = 1 To 8
For col = 1 To 8
temp = temp & checker(row, col) & "-"
Next

temp = ""
Next
End Sub

```

```public static void main(String[] args) {
String[][] checker = new String[9][9];

for (int i = 1; i < 9; i++)
{
for (int j = 1; j < 9; j++)
{
if (i % 2 == 0)
{
if (j % 2 == 1)
{
checker[i][j] = "black";
}
else
{
checker[i][j] = "white";
}
}
else
{
if (j % 2 == 1)
{
checker[i][j] = "white";
}
else
{
checker[i][j] = "black";
}
}
}
}

//PRINT IT OUT
String temp = "";
for (int i = 1; i < 9; i++)
{
for (int j = 1; j < 9; j++)
{
temp = temp + checker[i][j] + "-";
}

System.out.println(temp);
temp = "";
}
}
```