Question

I have just run across a problem which is common but I’m not sure why it’s happening in this instance.

string s;
int c1, c2, c3, c4;    

private void button2_Click(object sender, EventArgs e)
{
    String number;
    s = textBox1.Text;
    int[] d = s.Select(c => (int)c - (int)'0').ToArray();

    try
    {
        c1 = (4 * d[1] + 10 * d[2] + 9 * d[3] + 2 * d[4] + d[5] + 7 * d[6]) % 11;
        c2 = (7 * d[1] + 8 * d[2] + 7 * d[3] + d[4] + 9 * d[5] + 6 * d[6]) % 11;
        c3 = (9 * d[1] + d[2] + 7 * d[3] + 8 * d[4] + 7 * d[5] + 7 * d[6]) % 11;
        c4 = (d[1] + 2 * d[2] + 9 * d[3] + 10 * d[4] + 4 * d[5] + d[6]) % 11;
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
    }

    number = d[1]+d[2]+d[3]+d[4]+d[5]+d[6]+c1+c2+c3+c4.ToString();
    textBox2.Text = number;    
}

It will accept the number in the first TextBox(es) fine. As soon as it moves onto the catch section it will pop up with an error Index was outside the bounds of the array Is there something obvious I’m missing? or is this quite unique to my program?

Answer 1

I bellieve that you think your array goes from 1 to 6.
Its from 0 to 5.