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TextBox[] textArray = new TextBox[] { numText1, numText2, numText3, numText4, numText5, numText6, numText7, numText8 };

if (stepButton.Text == "開始")
{
stepButton.Text = "下一步";

for (int i = 7; i > 0; i--)
{
for (int j = 0; j < i; j++)
{
if (int.Parse(textArray[j].Text) > int.Parse(textArray[j + 1].Text))
{
string tmp = textArray[j + 1].Text;
textArray[j + 1].Text = textArray[j].Text;
textArray[j].Text = tmp;
}
}
}
for (int i = 0; i < 8; i++)
textArray[i].BackColor = Color.LightBlue;
targetText.Enabled = false;
}
else
{
int i, lowIndex = 0, highIndex = 0;

for (i = 0; i < 8; i++)
if (textArray[i].BackColor == Color.LightBlue)
break;
lowIndex = i;

for (i = 7; i > 0; i--)
if (textArray[i].BackColor == Color.LightBlue)
break;
highIndex = i;

for (i = 0; i < 8; i++)
textArray[i].BackColor = SystemColors.Window;

int midIndex = (highIndex + lowIndex) / 2;
if (textArray[midIndex].Text == targetText.Text)
{
MessageBox.Show("你所指定的數字在索引 " + midIndex + "的位置!");
stepButton.Text = "開始";
targetText.Enabled = true;
}

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